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Police ranks are a system of hierarchical relationships in police organisations. The rank system defines authority and responsibility in a police organisation, and affects the culture within the police force. Usually, uniforms denote the bearer's rank by particular insignia affixed to the uniforms. Parallel to the regional services are UK wide agencies, such as the British Transport Police and the national specialist units of certain territorial police forces, with a possibility of further variations. Due to policing in many countries developing from military organisations and operations, police ranks in many countries follow a logic similar to that of military ranks. Most of the British police ranks that exist today were, however, deliberately chosen by Home Secretary Sir Robert Peel so that they did not correspond with military ranking. They were enacted under the Metropolitan Police Act 1829.

All police forces have used a wide variety of ranks to meet their organisational needs, especially the Metropolitan Police Service. Ranks have been created, abolished, amalgamated and sometimes revived during the history of British policing. In the following table, "MET only" means those ranks are specific for the Metropolitan Police.

Officers holding ranks up to and including chief superintendent who are members of the Criminal Investigation Department (CID) or Special Branch (and certain other units) have the prefix "detective" before their rank. Due to the nature of their duties, these officers generally wear plain clothes (except for ceremonial purposes) and so do not wear the corresponding rank insignia; however, they still operate within the same structure as their uniformed counterparts. In the United Kingdom, detective ranks are not superior to those of uniformed officers and a detective has the same powers and authority as a uniformed officer of the same rank. The "detective" prefix designates that the officer has received suitable training and passed related examinations to conduct serious or complex criminal investigations.

There are various grades of special constable which assist in the tasking and management of the constabulary. The ranks are management grades; those holding them are not "sergeants" or "inspectors" for the purposes of the law (for example, authorisations to order the removal of disguises or to set up roadblocks). Originally, specials held the same ranks and used the same rank insignia as regular officers, but there was a general shift to distinct terms such as "area officer" and "divisional officer" in the 1980s. However, since 2000, the National Policing Improvement Agency has encouraged special constabularies to return to rank structures and epaulette insignia identical to their regular counterparts. Although most forces have now reverted to regular rank titles (with the prefix "special"), only some have reverted to regular rank insignia. Senior special constables have no authority over regular officers, but very experienced officers may occasionally be given administrative supervision of mixed units of regular and special constables for certain events where no regular supervisory officer is available.

Constables who are training to become detective constables sometimes bear the title trainee investigator (T/I) or trainee detective constable (T/DC). The prefix "temporary" before a rank (e. g. temporary detective sergeant, abbreviated T/DS) denotes an officer who has been temporarily promoted to a rank (and so who does actually hold that rank, albeit on a temporary basis), whilst the prefix "acting" (e. g. acting inspector, abbreviated A/Insp) denotes an officer who is performing the role of a higher rank than the one actually held (sometimes informally termed "acting up"). Temporary ranks are often used for set periods (e. g. a six month appointment to a particular role), whereas acting ranks, although sometimes held for extended periods, are often used for a very short time (e. g. a single shift when additional supervisory officers are required, or to replace an officer on short term leave). Under section 107 of the Police and Criminal Evidence Act 1984 (England and Wales only), sergeants and chief inspectors may be designated (by an officer of at least the rank of superintendent) to exercise the powers of an inspector or a superintendent respectively. Such a designation will generally accompany such an officer being given an acting rank, so for most operational purposes there is no difference between substantive, temporary and acting ranks at Inspector and above (although there may be differences as to pay, pensions and insignia). However, under section 36 of that act, only substantive sergeants may be appointed custody officers.

Ranks within volunteer police cadet schemes vary considerably across the territorial police forces.

Police community support officers, in general, do not have a rank system. The South Yorkshire Police and Kent Police, however, have designated PCSO supervisors.

Traffic wardens were administered by the police and exercised some police powers to control traffic or issue fixed penalty notices for traffic offences. as of 2017, very few police traffic wardens exist with a legacy of only ten police traffic wardens remaining in England and Wales. Section 46 of the Policing and Crime Act 2017 has in effect abolished police traffic wardens allowing police to focus on their core duties. The duties of traffic wardens have been passed to local authority civil enforcement officers (formerly parking attendants) who, under decriminalised parking enforcement, have powers to issue penalty charge notices for breaches of parking laws on highways or in local authority car parks and compel the production of a disabled parking permit (blue badge) for inspection. A similar situation has developed in Scotland with the functions of traffic wardens being taken over by local councils. In many areas parking legislation has been decriminalised and is enforced solely by council employed parking attendants.

Badges of rank are usually worn on the epaulettes. However, when in their formal uniform sergeants wear their rank insignia on their upper sleeves. Other specialist forces, and those outside of the United Kingdom (including British Overseas Territories such as Bermuda and Gibraltar, which are parts of the British sovereign territory in most of which internal competencies of governance are mostly delegated to local governments, and the Crown Dependencies of the Channel Islands and the Isle of Man, which are not parts of the British sovereign territory) use the same general system, but often have fewer senior ranks. Chief constable is the title of the head of each United Kingdom territorial police force except the Metropolitan Police and City of London Police, which are headed by commissioners. Ranks above chief superintendent are usually non operational management roles, and are often referred to as "chief officer" ranks, but the longer phrase "chief police officer" or similar in legislation is specifically a commissioner or chief constable, a "senior police officer" being their immediate deputy. The Commissioner of the Metropolitan Police is often considered to be the highest police rank within the United Kingdom, although in reality every chief constable and the two commissioners are supreme over their own forces and are not answerable to any other officer. Epaulettes are normally black with white sewn on or silver metal insignia, although high visibility uniforms are often yellow with black insignia.

The rank of an officer can be found in varying details of the uniform such as headgear, sleeve patches and tunic collar details. Insignia on hats and uniforms can vary between forces within the UK and the following tables below will not accurately represent all constabularies within the UK.

As a variation to the standard set, the deputy chief constable of the British Transport Police wears two rows of oak leaves on their hat.

The Police Service of Northern Ireland (PSNI) adopted the same rank system as elsewhere in the United Kingdom on 1 June 1970, but has a different version of the rank insignia, with the star from the PSNI badge replacing the crown. Unusually, the star is worn below the pip by chief superintendents and by the chief constable, who wears both symbols above his tipstaves. The PSNI has retained the RUC's distinctive inverted (point up) sergeants' chevrons, worn on the lower sleeve in formal uniform. PSNI officers do not wear the custodian helmet and female officers wear a different hat from other forces. The PSNI rank structure and epaulette insignia is the same as the territorial police in Great Britain, except that the crown is replaced with the design from the PSNI badge and sergeants' chevrons are point up. In addition to the epaulettes being a green colour rather than a black, this is to match their green uniforms. Headgear rank marking is the same as for England and Wales.

City of London Police insignia are gold where that of other forces is silver. For example, rank insignia and collar numbers on epaulettes are gold, as are the bands and oak leaves on the caps of senior officers, and officers of or above the rank of commander wear gold on black gorget patches on the collars of their tunics. The City of London Police also previously had variations for some acting ranks such as sergeant and inspector: acting sergeants wore their chevrons above their divisional letters (or later "CP" for all officers, following the abolition of the force's divisions), whereas substantive sergeants wear them below their collar numbers. Acting inspectors were denoted by a crown in the place of their divisional letters, whilst keeping their collar number and chevrons. The City of London Police use a different colour scheme for their police headwear. Instead of the black and white sillitoe "tartan" they use red and white. The assistant commissioner and commander wear a single row of oak leaves on their hats, and only the commissioner wears two rows.

Inspectors and chief inspectors in Merseyside Police wear silver instead of black lace on their hats, as did Liverpool City Police before them.

The Metropolitan Police uses different ranks above chief superintendent. The fabric used in the crowns is blue, whereas other police forces use red. Although they rank as deputy chief constables, deputy assistant commissioners wear two rows of oak leaves on their hats.

The Isle of Man police ranks follow the structure of other British police rank structures however it is notably missing the chief superintendent and assistant chief constable ranks within their own structure. The epaulettes for the constables and sergeants also have an addition of the Isle of Man Constabulary logo and motto above their collar numbers. Headgear rank marking is the same as for England and Wales.

Special constabulary epaulettes frequently bear the letters SC (with or without a crown above) to differentiate them from regular officers. Within the City of London Special Constabulary is the Honourable Artillery Company Specials; members of this unit wear HAC on the shoulders in addition to other insignia. Senior special constables wear the same markings on their hats as equivalent regular ranks. There is a large variation in the design of epaulettes used across Great Britain for specials. This has been recognised at national level and as part of the Special Constabulary National Strategy 2018–2023 the structure and insignia is under review with the intention to standardise. Other special constabularies use combinations of bars, half bars, pips, crowns, laurel wreaths, collar numbers, force crests and the SC identity (with or without a crown) to distinguish ranks (and/or role).

There are, in the United Kingdom, a number of miscellaneous constabularies. These are not operated, regulated or funded by the Home Office, although they are fully authorised (by Act of Parliament) establishments. In general, they provide the policing for ports, docks, tunnels, or other particular institutions. Although these forces tend to require high standards of training and accountability, which closely mirror those of the Home Office police forces, they are usually much smaller in terms of personnel, and therefore utilise fewer of the 'standard' ranks.

Officers taking part in public order and public safety (POPS) events and incidents wear colour coded rank slides to denote command and support roles. Bronze commanders can be of varying ranks and not just chief inspectors as shown below. Tactical advisers can also be of differing ranks, but are most commonly constables or sergeants. It is a requirement under the College of Policing Public Order Manual that all officers, regardless of rank, display an identifying number on their epaulettes. Therefore, ranks such as inspector have collar/warrant numbers displayed on their public order colour coded epaulettes that they might not have as part of their normal uniform.

Police community support officers bear epaulettes with the words "Police community support officer" and their shoulder number, or, in the Metropolitan Police, a borough identification code and shoulder number. South Yorkshire Police PCSO supervisors wear a bar above the words "Police community support officer supervisor" and the shoulder number.

The following table presents defunct rank insignia of the Metropolitan Police.