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Same sex marriage is legal in all parts of the United Kingdom. As marriage is a devolved legislative matter, different parts of the United Kingdom legalised at different times; it has been recognised and performed in England and Wales since March 2014, in Scotland since December 2014, and in Northern Ireland since January 2020. Civil partnerships, which offer most, but not all, of the rights and benefits of marriage, have been recognised since 2005. The United Kingdom was the 27th country in the world and the sixteenth in Europe to allow same sex couples to marry nationwide. Legislation to allow same sex marriage in England and Wales was passed by the Parliament of the United Kingdom in July 2013 and took effect on 13 March 2014. The first same sex marriages took place on 29 March 2014. Legislation to allow same sex marriage in Scotland was passed by the Scottish Parliament in February 2014 and took effect on 16 December 2014. The first marriage ceremonies for same sex couples previously in civil partnerships occurred on 16 December. The first marriage ceremonies for couples not in civil partnerships occurred on 31 December 2014. Legislation to allow same sex marriage in Northern Ireland was passed by the Parliament of the United Kingdom in July 2019 and took effect on 13 January 2020. The first same sex marriage ceremony took place on 11 February 2020. Same sex marriage is legal in eight of the fourteen British Overseas Territories. It has been recognised in South Georgia and the South Sandwich Islands since 2014, Akrotiri and Dhekelia and the British Indian Ocean Territory (for UK military personnel only) since 3 June 2014, the Pitcairn Islands since 14 May 2015, the British Antarctic Territory since 13 October 2016, Gibraltar since 15 December 2016, the Falkland Islands since 29 April 2017, and Saint Helena, Ascension and Tristan da Cunha since 20 December 2017. Same sex marriage was formerly legal in Bermuda from 2017 to 2022, where domestic partnerships have been available to same sex couples since 1 June 2018. Civil partnerships were legalised in the Cayman Islands on 4 September 2020. Same sex marriage is legal in the Crown Dependencies. It has been recognised and performed in the Isle of Man since 22 July 2016, in Jersey since 1 July 2018, and in the Bailiwick of Guernsey at different times: in Guernsey since 2 May 2017, in Alderney since 14 June 2018, and in Sark since 23 April 2020.

In common law, a marriage between persons of the same sex was void ab initio. In 1680, Arabella Hunt married "James Howard"; in 1682 the marriage was annulled on the ground that Howard was in fact Amy Poulter, a 'perfect woman in all her parts', and two women could not validly marry. On 30 March 1834, Anne Lister and Ann Walker were married at the Holy Trinity Church at Goodramgate in York, and thereafter considered themselves married, but without legal recognition. The church has been described as "an icon for what is interpreted as the site of the first lesbian marriage to be held in Britain", and the building now hosts a commemorative blue plaque. The couple lived together at Shibden Hall until Lister's death in 1840. In 1866, in Hyde v Hyde and Woodmansee (a case of polygamy), Lord Penzance's judgment began: "Marriage as understood in Christendom is the voluntary union for life of one man and one woman, to the exclusion of all others." In Talbot (otherwise Poyntz) v Talbot in 1967, the prohibition was held to extend where one spouse was a post operative transsexual, with Justice Roger Ormrod stating: "Marriage is a relationship which depends on sex, not on gender". In 1971, the Nullity of Marriage Act was passed, explicitly banning marriages between same sex couples in England and Wales. The parliamentary debates on the 1971 act included discussion on the issue of transsexualism but not homosexuality. The 1971 act was later replaced by the Matrimonial Causes Act 1973, which also declared that a marriage was void if the parties were not respectively male and female. Prohibition of same sex marriages was also included in the marriage legislation of Scotland and Northern Ireland. The Marriage Order (Northern Ireland) 2003 stated there was a legal impediment to marriage if the parties were of the same sex, but the Marriage (Same sex Couples) and Civil Partnership (Opposite sex Couples) (Northern Ireland) Regulations 2019 removed this provision. The Marriage Act (Scotland) 1977 had a similar legal impediment, but following the passage of the Marriage and Civil Partnership (Scotland) Act 2014, the act no longer prohibits marriages if both parties are of the same sex. On 17 July 2013, royal assent was granted to the Marriage (Same Sex Couples) Act 2013. On 10 December 2013, Her Majesty's Government announced that the first same sex marriages would take place from 29 March 2014.

The Civil Partnership Act 2004 came into effect in December 2005. It created civil partnerships, which gave same sex couples who entered into them most of the rights and responsibilities of marriage. These partnerships were called 'gay marriages' by some of the British media; however, the government made clear that they were not marriages. Before this, an informal London Partnership Register had been set up in 2001 by the Mayor of London, Ken Livingstone, but without any legal recognition. Since Section 9 of the Marriage (Same Sex Couples) Act 2013 took effect, any couple registered in a civil partnership is granted the ability to convert that partnership into a marriage.

On 26 August 2003, Celia Kitzinger and Sue Wilkinson, both British university professors, legally married in British Columbia, Canada. However, on their return their marriage was not recognised under British law. Under the subsequent Civil Partnership Act, it was converted into a civil partnership. The couple sued for recognition of their marriage, arguing that it was legal in the country in which it was executed and met the requirements for recognition of overseas marriages and should thus be treated in the same way as one between opposite sex couples. They rejected the conversion of their marriage into a civil partnership believing it to be both practically and symbolically a lesser substitute. They were represented by civil rights group Liberty. The group's legal director James Welch said it was a matter of fairness and equality for the couple's marriage to be recognised and that they "shouldn't have to settle for the second best option of a civil partnership". The High Court announced its judgement on 31 July 2006, ruling that their union would not be granted marriage status and would continue to be recognised in England and Wales as a civil partnership. The president of the Family Division, Sir Mark Potter, gave as his reason that "abiding single sex relationships are in no way inferior, nor does English Law suggest that they are by according them recognition under the name of civil partnership", and that marriage was an "age old institution" which, he suggested, was by "longstanding definition and acceptance" a relationship between a man and a woman. He agreed with the couple's claim that they were being discriminated against by the Civil Partnership Act 2004, but considered that "To the extent that by reason of that distinction it discriminates against same sex partners, such discrimination has a legitimate aim, is reasonable and proportionate, and falls within the margin of appreciation accorded to Convention States." Attorney General Peter Goldsmith, as second respondent, sought £25,000 in legal costs from the couple, which the High Court ordered them to pay. Wilkinson and Kitzinger said they were "deeply disappointed" with the judgement, not just for themselves, but for "lesbian and gay families across the nation". They said, however, that they believed the judgement "won't stand the test of time" and that they looked forward to the day when "there is full equality in marriage". Gay rights campaigner Peter Tatchell said that the establishment's aggressive opposition to same sex marriage and the successful demand of £25,000 from the couple damaged the government's "gay friendly credentials". He also claimed that the demand in legal costs was designed to damage the couple financially so they would not be able to appeal.

Equal Marriage, a campaign for same sex marriage in Scotland, was established by the Equality Network in 2008, with a focus on securing same sex marriage and different sex civil partnerships in Scotland. In England and Wales, the first major campaign for same sex marriage was Equal Love established by Peter Tatchell in 2010. The first major campaign against same sex marriage in Britain was Scotland for Marriage established in 2011, followed by the Coalition for Marriage in England and Wales in 2012. Subsequent campaigns for and against same sex marriage have been established by a wide variety of organisations, including the Coalition for Equal Marriage and Out4Marriage, both established in England in 2012. In Northern Ireland, a campaign for full same sex marriage was established by LGBT rights activist and political campaigner Gary Spedding in June 2012 with the specific goal of challenging social attitudes whilst lobbying the Northern Ireland Assembly to enact legislation to permit same sex marriages.

Conservative Party: During the run up to the 2010 general election, the then Shadow Chancellor of the Exchequer, George Osborne, said that a Conservative government would be happy to "consider the case" for ending the ban on same sex marriage, although he was criticised for not making any specific promises. On 4 May 2010, the party published a "Contract for Equalities" which said it would 'consider' recognising civil partnerships as marriages if elected. Labour Party: In April 2010, Labour Minister for Equality Harriet Harman when asked about same sex marriage said the issue was a "developing area" and that the government still had a "long way to go" with gay rights. Prime Minister Gordon Brown said the government did not allow same sex marriage because it was "intimately bound up with questions of religious freedom". During the 2010 Labour leadership election campaign, each of the Labour candidates expressed their support for reform to lead to the recognition of same sex marriage. Following Ed Miliband's victory, it became Labour party policy, with the party welcoming Her Majesty's Government's consultation and calling for legislation to be brought forth as soon as possible. Liberal Democrats: Leader Nick Clegg stated in 2009 that his party backed legalisation. On 4 July 2009, in an article for LabourList, Clegg wrote that "although civil partnerships have been a step forward, until same sex marriage is permitted it is impossible to claim gay and straight couples are treated equally." Following this, the party's LGBT rights group LGBT+ Liberal Democrats launched the petition "Marriage Without Borders" calling for all gender restrictions on marriage and civil partnerships to be lifted, and for same sex relationships to be recognised across Europe and internationally. The petition was run at Manchester Pride and Reading Pride in 2009, and launched online in January 2010, following an interview with Clegg in Attitude magazine in which he reaffirmed his commitment to same sex marriage. However, this did not make it into the party's manifesto. In an interview in July 2010, Liberal Democrat Deputy Leader Simon Hughes confirmed that the coalition government was planning to open marriage to same sex couples, saying, "It would be appropriate in Britain in 2010, 2011, for there to be the ability for civil marriage for straight people and gay people equally The state ought to give equality. We're halfway there. I think we ought to be able to get there in this parliament". In September 2010, the Liberal Democrats voted at their Autumn Federal Conference to make same sex marriage a party policy at the Westminster level. The Scottish Liberal Democrats had already approved a motion at their 2010 spring conference calling on the Scottish Government to allow same sex couples to marry, describing the exclusion of same sex couples from marriage as a "discrimination that needs to end". Green Party of England and Wales: On 22 May 2009, the Green Party called for an end to the ban on civil marriages between same sex couples in Britain and in other EU member states. Party leader Caroline Lucas said the party wants marriage for same sex couples and that married same sex couples who travel throughout Europe should be able to have their relationship recognised on the same basis as married heterosexual couples. Peter Tatchell, who was the party's candidate for Oxford East at the time, said there is a "confusing patchwork" of different partnership laws throughout Europe and that "for a majority of lesbian and gay couples their legal rights stop at their own borders". He said, the "best and most universally recognised system of partnership" is civil marriage and, "anything less is second class and discrimination".

At their Yearly Meeting in 2009, the Quakers decided to recognise opposite sex and same sex marriages equally and perform marriage ceremonies for same sex couples, making them the first mainstream religious body in the United Kingdom to do so. Under the law at that time, registrars were not allowed to legally officiate at a marriage between same sex couples but the Quakers stated that the law did not preclude them from "playing a central role in the celebration and recording of same sex marriages" and asked the government to change the law so that these marriages would be recognised. In a joint press release in 2012, the Quakers, Liberal Jews, and Unitarians gave their endorsement to the same sex marriage consultation. The largest Christian denominations have been wholly opposed to the legislation to recognise and perform same sex marriages. The leaders of the Catholic Church in England and Wales have been vocal in opposition, urging both parishioners and schools within its care to sign a petition against the government plans, as did the Catholic Church in Scotland. The leaders of the Church of England were concerned that the legalisation regarding same sex marriage would undermine the Church's position as the state religion of England. The Methodist Church of Great Britain, in responding to the government consultation on same sex marriage, acknowledged in 2012 that many Methodist churches had, over the previous 20 years, affirmed and celebrated the participation of gay men and lesbians in a union, but noted that the Methodist Church would not use the word "marriage" with reference to same sex unions. However, in June 2021 the Methodist Church's conference voted to allow same sex marriages to be solemnised in their places of worship. The Chief Rabbi, Baron Sacks, and the Rabbinical Council of the United Synagogue also came out in opposition to the plans, stating that same sex marriage is "against Jewish law".

Opinion polls have shown general support for same sex marriage among Britons. Attitudes towards homosexuality amongst the British public have become more supportive (or at least tolerant) over time; according to the British Social Attitudes Survey, in 1983 approximately 50% to 70% of respondents of the three major political parties (Conservative, Labour and Liberal Democrat) regarded homosexuality as "always wrong" or "mostly wrong" and in 1993 opposition to homosexuality was reported to have slightly increased amongst all parties. However, by 2003 attitudes had become more tolerant, with 25% to 50% of respondents regarding homosexuality as always or mostly wrong and by 2013, only around 20% to 35% of respondents in each party felt the same way. Liberal Democrat respondents tended to be less likely to regard homosexuality as wrong than Labour or Conservative respondents across each survey. A 2004 poll by Gallup reported that 52% of respondents agreed that 'marriages between homosexuals' should be recognised, while 45% said they should not. The poll also found that 65% supported allowing same sex couples to form civil unions. A 2006 Eurobarometer survey reported that 46% of British people agreed that same sex marriages should be allowed throughout Europe, slightly higher than the European Union average of 44%. A poll conducted in September 2008 by ICM Research for The Observer found that 55% of Britons believed that same sex couples should be allowed to get married, with 45% against. An opinion poll conducted in June 2009 by Populus for The Times reported that 61% of the British public agreed with the statement "Gay couples should have an equal right to get married, not just to have civil partnerships", while 33% disagreed. Support was highest among those aged between 25 and 34, where 78% agreed and 19% disagreed. It was lowest amongst those over 65 where 37% agreed and 52% disagreed. A majority of both men and women agreed, but support was higher among women (67%) than men (55%). In terms of voting intention, 73% of Liberal Democrats, 64% of Labour voters and 53% of Conservatives agreed that same sex couples should have the right to marry. A poll conducted by Angus Reid Public Opinion in July 2010 showed that 78% of British people supported either same sex marriage or civil partnerships for same sex couples, with 41% opting for same sex marriage and 37% opting for civil partnerships. Support for no legal unions for same sex couples decreased by 3% from August 2009. According to the 2010 Scottish Social Attitudes Survey, 61% of Scottish people supported same sex marriage, while 19% did not, and 18% neither agreed nor disagreed. In a similar poll in 2002, 42% of Scotland's population supported same sex marriage. In 2006, 53% of Scots backed same sex marriage. In July 2011, a representative survey conducted by Angus Reid Public Opinion showed that 43% of Britons believed same sex couples should be legally allowed to marry, 34% thought same sex couples should only be allowed to form civil partnerships, and 15% would grant no legal recognition to same sex couples. A poll published by YouGov in March 2012 showed that 43% of British people supported same sex marriage, while 32% supported civil partnerships, and 16% were opposed to any legal recognition of same sex relationships. Support was particularly high amongst women, young people, people in Scotland and Liberal Democrat voters. Support was lower among the working class, older people, Conservative voters, and men in general. In the same poll, 62% expressed a belief that homosexual relationships had the same value as heterosexual ones, but 47% of people supported the right of the Church of England to defend different sex marriage and 37% disagreed. A June 2012 YouGov survey indicated increasing support for LGBT rights among the British people. The report found that 71% were in favour of same sex marriage. Two YouGov polls in December 2012 found that 55% of the population were in favour of introducing same sex marriage. Another poll in May 2013 confirmed public support for the same sex marriage bill, with 53% in favour. A second poll in May showed a similar level of support (54%), and also found that 58% of those who considered same sex marriage an important election issue would be more likely to vote for a party that supported it. A May 2013 Ipsos poll found that 55% of respondents were in favour of same sex marriage. A poll by BBC Radio in March 2014 found that 68% of respondents supported same sex marriage and 26% opposed it. The research also found that young people were more likely to support same sex marriage, with 80% support from 18–34 year olds, compared with 44% of over 65s. 75% of women were in favour, compared to 61% of men. A face to face survey conducted in 2015 by ICM Research for Channel 4 found that 16% of British Muslims agreed with the statement that same sex marriage should be legal in Britain, with 56% disagreeing. The survey also found that only 18% thought homosexuality should be legal in Britain, with 52% disagreeing. The 2015 Eurobarometer found that 71% of Britons thought same sex marriage should be allowed throughout Europe, while 24% were opposed. A September–October 2016 survey by the Varkey Foundation found that 77% of 18–21 year olds supported same sex marriage in the United Kingdom. According to an Ipsos poll published in April 2018, 73% of the British public supported same sex marriage, while 8% believed it should be banned. A further 13% personally disapproved of it, but did not wish to have it banned again. Additionally, the same poll found that 66% would approve of a royal same sex wedding. A Pew Research Center poll, conducted between April and August 2017 and published in May 2018, showed that 77% of Britons supported same sex marriage, 20% were opposed and 3% did not know or refused to answer. When divided by religion, 83% of non practising Christians, 82% of religiously unaffiliated people and 63% of church attending Christians supported same sex marriage. Opposition was 13% among 18–34 year olds. A June 2018 YouGov opinion poll found that 80% of British people supported the introduction of same sex marriage in Northern Ireland, with 66% of Northern Irish respondents in favour. 70% of Conservative voters, 89% of Labour voters and 90% of Liberal Democrat voters were in favour of its introduction. Among "Remain" voters, 90% supported same sex marriage in Northern Ireland, whereas "Leave" voters supported it at 68% (this was at a time when in the aftermath of the 2016 EU referendum the issue of Brexit dominated British politics). The 2019 Eurobarometer found that 85% of Britons thought same sex marriage should be allowed throughout Europe, while 12% were opposed. A YouGov poll conducted in September 2022 showed that 76% of Britons supported same sex marriage, 13% were opposed and 10% did not know. More specifically, 52% strongly supported, while 24% "tend[ed] to support" same sex marriage. Conversely, 7% "tend[ed] to oppose", while 6% strongly opposed same sex marriage. A Pew Research Center poll conducted between February and May 2023 showed that 74% of Britons supported same sex marriage, 22% were opposed and 4% did not know or refused to answer. When divided by political affiliation, support was highest among those on the left and the centre of the political spectrum at 81%, followed by those on the right at 65%. A June 2023 YouGov poll showed that 78% of Britons supported same sex marriage.

Same sex marriage became legal in Northern Ireland on 13 January 2020. In previous years, the Northern Ireland Assembly had voted on the issue on five occasions, winning a majority for same sex marriage once. Previously, same sex marriages performed in England, Wales and Scotland were recognised as civil partnerships in Northern Ireland.

Legislation to allow for the recognition of same sex marriages in Northern Ireland has been debated in the Assembly five times since 2012. On four of those occasions, only a minority of assembly members voted in favour of same sex marriage, though the most recent vote on the issue in November 2015 saw a majority of MLAs vote in favour of same sex marriage. On 27 April 2015, the Northern Ireland Assembly voted for the fourth time on the recognition of same sex marriage. The motion for recognition was introduced by Sinn Féin and was defeated by a majority of 49 votes to 47; all Democratic Unionist (DUP) members in the Assembly voted against it, while all Sinn Féin, Green Party and NI21 members voted for it. On 2 November 2015, 105 MLAs voted on a motion to recognise same sex marriage, with 53 voting in favour and 52 voting against, the first time same sex marriage had received majority support in the Assembly. However, the Democratic Unionist Party tabled a petition of concern, preventing the motion from having any legal effect. Sinn Féin said that legislation regarding same sex marriage would be a priority for the party in the Assembly elected in May 2016. On 23 June 2016, Finance Minister Máirtín Ó Muilleoir announced he had requested that officials in the Northern Ireland Executive begin drafting legislation to allow same sex marriage, stating that MLAs would much rather vote on the issue than "be forced to legislate [following] an adverse judgment" in the courts. In October 2016, First Minister Arlene Foster reaffirmed the DUP's opposition to same sex marriage, saying the party would continue to issue a petition of concern blocking same sex marriage in the Assembly over the next five years. The DUP won fewer than 30 seats at the March 2017 elections, meaning it lost the right to unilaterally block a bill using a petition of concern. Karen Bradley, the Secretary of State for Northern Ireland, stated in February 2018 that same sex marriage could be legislated for in Northern Ireland by the UK Parliament, and that the government would likely allow a conscience vote for its MPs if such legislation was introduced. Labour MP Conor McGinn said he would introduce a private member's bill extending same sex marriage to Northern Ireland by the end of March 2018. The Marriage (Same Sex Couples) (Northern Ireland) Bill was introduced to the House of Commons on 28 March 2018, and passed its first reading. The bill's second reading in the Commons was blocked by a Conservative MP on three occasions in 2018. An identical bill was introduced to the House of Lords on 27 March by Baron Hayward, and passed its first reading that day. As both bills were private member's bills without government support, they failed to progress any further. In February 2019, Lord Hayward withdrew an amendment to an unrelated government bill, which if passed would have extended same sex marriage to Northern Ireland, on opposition from government Lords. On 1 November 2018, royal assent was granted to the Northern Ireland (Executive Formation and Exercise of Functions) Act 2018, which contains sections describing Northern Ireland's same sex marriage and abortion bans as human rights violations. The law did not legalise same sex marriage in Northern Ireland, but directed the British Government to "issue guidance" to civil servants in Northern Ireland "in relation to the incompatibility of human rights with [the region's laws on the two issues]". The law passed 207–117 in the House of Commons.

In July 2019, McGinn announced his intention to attach an amendment to an upcoming administrative bill relating to Northern Ireland, which would legalise same sex marriage three months after passage of the bill if the Northern Ireland Assembly remained suspended. Under the terms of the originally drafted amendment, the region's executive could approve or repeal the measure upon resumption. The amendment passed in the House of Commons with 383 votes in favour and 73 votes against. McGinn's amendment, which was further amended by Lord Hayward during passage in the House of Lords, required the Secretary of State to issue regulations extending same sex marriage to Northern Ireland if the Assembly had not reconvened by 21 October 2019. If this occurred, then the regulations would come into effect on 13 January 2020. The bill passed its final stages in the Parliament and received royal assent on 24 July 2019, becoming the Northern Ireland (Executive Formation etc) Act 2019. On 21 October 2019, 31 unionist MLAs signed a petition to reconvene the Northern Ireland Assembly to pass legislation to keep abortion illegal. The sitting was boycotted by Sinn Féin, the Alliance Party, the Green Party, and People Before Profit, and as a result the speaker, Robin Newton, ruled that the Assembly could not conduct business after an election unless a speaker could be elected on a cross community vote. The sitting was therefore abandoned, and the Secretary of State for Northern Ireland, Julian Smith, stated in the House of Commons that the British Government would issue the regulations as obliged. The regulations came into effect on 13 January 2020, and the first legal same sex wedding ceremony in Northern Ireland took place on 11 February 2020 between Robyn Peoples and Sharni Edwards Peoples in Belfast.

Two legal challenges to Northern Ireland's same sex marriage ban were heard in the High Court in November and December 2015. Two couples, Grainne Close and Shannon Sickles and Chris and Henry Flanagan Kanem, brought the case claiming that Northern Ireland's prohibition on same sex marriage breached their human rights. The case was heard simultaneously with a case brought in January 2015 in which two men who wed in England sought to have their marriage recognised in Northern Ireland. The appeal was heard by a three judge panel of the Court of Appeal on 16 March 2018; a ruling had been expected some time in 2019. On 7 April 2020, the Court of Appeal in Belfast ruled that same sex couples faced unjustified discrimination while denied the opportunity to marry in Northern Ireland. But with changes to the law meaning same sex weddings can take place in Northern Ireland since 11 February 2020, senior judges decided not to make a formal declaration on any human rights breach.

A September 2014 LucidTalk poll for the Belfast Telegraph showed that 40.1% of the population supported same sex marriage, while 39.4% opposed and 20.5% either had or stated no opinion. Of those that gave an opinion, 50.5% supported and 49.5% opposed same sex marriage. A poll in May 2015 found that 68% of the population supported same sex marriage, with support rising to 75% in Belfast. A "mass rally", organised by the Irish Congress of Trade Unions, Amnesty International, and the Rainbow Project took place in Belfast on 13 June 2015, with a 20,000 person turnout. A June 2016 poll placed support for same sex marriage at 70%, while those opposing it at 22%. An April 2018 poll put support for same sex marriage among Northern Ireland's population at 76%, while 18% were opposed.

Most major religious organisations in the United Kingdom do not perform same sex marriages in their places of worship. Some smaller Christian denominations such as the Dutch Church in London, Quakers and Unitarians perform same sex marriages. In addition, Liberal Judaism and the Movement for Reform Judaism perform same sex marriages, and campaigned in favour of legislation. Pagans also perform same sex marriages. In May 2016, the Oasis Church Waterloo in London applied for a licence that would allow it to conduct same sex marriages. Pastor Steve Chalke said "Oasis Church in Waterloo has reached the decision. It's taken us some time to reach it, that this is something we want to do". In June 2016, the Scottish Episcopal Church became the first British province in the Anglican Communion to take steps to allow same sex marriages to be performed in their churches. The General Synod voted in favour of a motion to begin discussion amongst the seven dioceses to remove the doctrinal clause which stated that marriage was "between a man and a woman". The vote received support from five of seven bishops, 69% of the clergy and 80% of the laity. The General Synod formally approved the change to the doctrinal clause in June 2017, removing language stating that marriages could only be "between a man and a woman" and introducing a new conscience clause which allows clergy to opt out of performing same sex weddings. On 20 July 2017, it was announced that a same sex wedding was to be held at St Mary's Cathedral in Glasgow later in the summer. On 1 August 2017, a same sex marriage, which included the Eucharist as a nuptial mass, was held at the Church of St John the Evangelist in Edinburgh. The Scottish Episcopal Church is estimated to have 100,000 members, and offers same sex marriage to other Anglicans, including members of churches in England and the United States. In July 2016, the United Reformed Church voted overwhelmingly to allow its churches to perform same sex marriages. The Church, with 60,000 members and 1,400 congregations, became the largest Christian denomination in the United Kingdom to offer same sex marriages at that time. In June 2021 the Methodist Church of Great Britain voted to permit same sex marriage in their places of worship. The Methodist Conference voted 254 to 46 in favour of the move. A freedom of conscience clause allows ministers with objections to opt out of performing same sex weddings. With about 164,000 members and 4,000 churches, the Methodist Church became the largest Christian denomination in the country to permit same sex marriages at that time. Among the first couples to wed were Jason and Ben McMahon Riley who married at the Fulwood Methodist Church in Preston, Lancashire on 17 June 2021. The Catholic Church opposes same sex marriage and does not allow its priests to officiate at such marriages. In December 2023, the Holy See published Fiducia supplicans, a declaration allowing Catholic priests to bless couples who are not considered to be married according to church teaching, including the blessing of same sex couples. The British Confraternity of Catholic Clergy released a statement on 21 December that the blessings outlined in Fiducia supplicans are "theologically, pastorally and practically inadmissible".

In January 2023, bishops of the Church of England refused to support a change to permit same sex couples to marry in its churches. However, the bishops supported a "prayers of dedication, thanksgiving or for God's blessing" for same sex couples following a civil marriage or partnership. The General Synod of the Church of England voted 250–181 to support the move in early February. Archbishops Justin Welby and Stephen Cottrell said, "It has been a long road to get us to this point. For the first time, the [Church of England] will publicly, unreservedly and joyfully welcome same sex couples in church. The church continues to have deep differences on these questions which go to the heart of our human identity. As archbishops, we are committed to respecting the conscience of those for whom this goes too far and to ensure that they have all the reassurances they need in order to maintain the unity of the church as this conversation continues." Religious same sex marriage ceremonies in the Church of England are supported by some clergy, including the Bishop of Oxford, Steven Croft, and the Bishop of Reading, Olivia Graham. In March 2023, Labour MP Ben Bradshaw introduced a bill to Parliament to "allow, in certain circumstances, priests and parishes [of the Church of England] that wish to conduct same sex weddings to do so". A 2023 survey conducted by The Times showed that 53% of priests in the Church of England supported religious same sex marriage ceremonies in the church. On 15 November, the General Synod voted to allow clergy to bless same sex marriages. The measure, which passed with a one vote majority, took effect on 17 December 2023. Among the first couples to receive a blessing were Reverend Catherine Bond and Reverend Jane Pearce during Holy Eucharist on 17 December at St. John the Baptist Church in Felixstowe, Suffolk. Reverend Canon Andrew Dotchin, who offered the blessing, described the couple's relationship as a "pilgrimage graced by [God's] blessing".

In May 2018, the Church of Scotland voted to draft new laws that would allow ministers to conduct same sex marriages. The motion was passed by the General Assembly by a vote of 345 to 170. The legal questions committee had two years to draft legislation. In May 2021, the General Assembly voted 319–217 to approve the draft legislation. The law includes safeguards for ministers opposed to performing same sex marriages. The presbyteries voted 29–12 in support of the legislation in April, and the General Assembly gave its final approval on 23 May 2022 by 274 votes to 136. Reverend Scott Rennie, the minister of Queen's Cross Church in Aberdeen, welcomed the move, saying, "My marriage to my husband, Dave, nurtures my life and my ministry, and frankly I do not think I could be a minister of this church without his love and support. It is always there in the background. Same sex marriage is like opposite sex marriage and it has its joys and sorrows, its glories and its tensions. It's pretty normal, really." The vote made the Church of Scotland the largest church in the United Kingdom to allow same sex marriages.

In September 2021, the Church in Wales voted to bless–but not perform–same sex marriages in the church. The move was supported unanimously by the bishops, while the clergy voted 28 to 12 in favor with two abstentions, and the laity voted 49 to 10 with one abstention. Gregory Cameron, bishop of the Diocese of St Asaph, said the decision was a "huge step forward for the church and for us all in Wales". The measure includes a conscience clause, allowing individual clergy to decide whether or not to offer blessings. Cameron performed the first blessing of a same sex relationship on 13 November 2021 for Father Lee Taylor, the Vicar of Llangollen, and his partner Fabiano Da Silva Duarte.

Following the Consular Marriage and Marriages under Foreign Law Order 2014, "a consular marriage may take place in those countries or territories outside the United Kingdom which have notified the Secretary of State in writing that there is no objection to such marriages taking place in that country or territory and which have not subsequently revoked that notice". Same sex consular marriages are possible in 26 countries: Australia, Azerbaijan, Bolivia, Cambodia, Chile, China (including Hong Kong), Colombia, Costa Rica, the Dominican Republic, Estonia, Germany, Hungary, Japan, Kosovo, Latvia, Lithuania, Mongolia, Montenegro, Nicaragua, Peru, the Philippines, Russia, San Marino, Serbia, the Seychelles and Vietnam. 240 consular same sex marriages were performed between June 2014 and the end of December 2015. An additional 140 couples converted their civil partnerships into marriages. Consular marriages for same sex couples were particularly popular in Australia prior to the country's legalisation of same sex marriage in 2017. 445 couples had married in British consulates across Australia by October 2017.

Same sex marriage is legal and performed in the three Crown Dependencies of Britain and in eight of the fourteen Overseas Territories.

Isle of Man – Legislation allowing the performance and recognition of same sex marriage was approved by the House of Keys on 8 March 2016, and by the Legislative Council on 26 April 2016. The legislation was granted royal assent and went into effect on 22 July 2016. Guernsey – The States of Guernsey approved a motion to legislate for the recognition and performance of same sex marriage in December 2015. The Same Sex Marriage (Guernsey) Law, 2016 was approved by the States in September 2016 by a vote of 33–5, and gained royal assent on 14 December 2016. The law went into effect on 2 May 2017. The legislation does not extend to Guernsey's dependencies, Alderney and Sark. Alderney – A bill to allow same sex marriage was approved by the States of Alderney on 18 October 2017, and received royal assent on 13 December 2017. The law came into effect on 14 June 2018. Sark – On 17 December 2019, the Chief Pleas approved legislation mirroring the provisions of Guernsey's same sex marriage law. The bill received royal assent in the Privy Council on 11 March 2020, and came into effect on 23 April 2020. Jersey – A motion to introduce legislation regarding same sex marriage was approved by the States Assembly in September 2015. A same sex marriage bill was eventually debated by the States on 1 February 2018, where it passed by a vote of 42–1. The law received royal assent on 23 May 2018 and went into effect on 1 July 2018.