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Red cross on a white background

In heraldry, Saint George's Cross (or the Cross of Saint George) is a red cross on a white background, which from the Late Middle Ages became associated with Saint George, the military saint, often depicted as a crusader. Associated with the crusades, the red on white cross has its origins in the 10th century. It has been used as the ensign of the Republic of Genoa from perhaps as early as the 10th century. The symbol was adopted by the Swabian League in the pre Reformation Holy Roman Empire. George became associated as patron saint of England in the fourteenth century, replacing St Edmund the Martyr. Since then this flag is commonly identified as the national flag of England. Saint George is the patron saint of the Spanish semi autonomous region of Catalonia and of the country of Georgia. It figures in the coat of arms of Barcelona. The national flag of Georgia supplements this cross with Jerusalem crosses. Across the rest of Northern Italy as the symbol of Bologna, Genoa, Padua, Reggio Emilia, Mantua, Vercelli and Alessandria, the form has only received a cult of Saint George bolstering and simplification to the cross of Saint Ambrose, the origin of the cross in their civic designs, as the latter was adopted by the Commune of Milan in 1045, Ambrose having been a late 4th century bishop of that city.

A combined British flag was created in 1606 (after the dynastic union of England and Scotland in 1603, the so called "Union of the Crowns") by combining Saint George's Cross with the Saint Andrew's Cross (the flag of Scotland). The flag was initially for maritime display, later restricted to the King's ships. Afterwards, the Saint George flag remained the flag of England for other purposes until the Acts of Union 1707. At the union, the first Union Flag became official for all purposes in the new Kingdom of Great Britain. From this time, the Saint George's Cross came to be seen as a symbol of England and Wales when used alongside symbols for Scotland or Ireland; so in the flags of the Commonwealth of England during 1649 to 1660. The flag of Saint George is also the rank flag of an Admiral in the Royal Navy, and civilian craft are forbidden to fly it. However, surviving little ships of Dunkirk, which participated in the Dunkirk evacuation during World War II, are allowed to fly it as a jack. This is normally done in the defaced form of the Dunkirk jack. Churches belonging to the Church of England may fly the Saint George's Cross (unless another flag is flown by custom for special reasons). The correct way for the church to fly the Saint George's cross (since an order from the Earl Marshal in 1938) is with the arms of the diocese in the upper left hand corner of the flag. The flag of St George has enjoyed a resurgence in popularity since the late 20th century, partly due to football inspired nationalism, and also in response to the devolution movements in Scotland and Wales. During the 2010 World Cup, UK Prime Minister David Cameron told Parliament that the flag would fly above his official residence at "no extra cost to the tax payer" while England played in the contest.

Most of the derived usage is from the flag of England. That article has illustrations of its derivations particularly across Canada, eastern Australia, the Caribbean and the Channel Islands apart from Jersey since Guernsey commonly used the English flag from 1936 (then moved to its present variant in 1985), however the illustrations below have an extremely complex or nil derivation from that flag. The flag of the City of London use the St George's Cross on a white background, with a red sword in the canton. The sword is believed to represent the sword that beheaded Saint Paul who is the patron saint of the city.

Saint George is the patron saint of the nation of Georgia, and the Saint George flag was supposedly used in the 5th century by Georgian king Vakhtang Gorgasali. In the 13th century, Queen Tamar of Georgia used the Saint George flag during her campaign against Seljuk Turks. The four Jerusalem crosses were later added by King George V of Georgia, who drove out the Mongols from Georgia in 1334. The flag fell out during the Russian annexation of Georgia and abolition of the Georgian monarchy. However, the flag was revived by the Georgian patriotic movement in the 1990s. A majority of Georgians supported the restoration of the medieval flag of Georgia, including the influential Catholicos Patriarch of All Georgia Ilia II of the Georgian Orthodox Church. The flag was finally adopted by the Georgian parliament on 14 January 2004. It was formally endorsed by a presidential decree signed by Mikheil Saakashvili on 25 January, following his election as President of Georgia. The Georgian Navy's naval ensign also used a St. George's Cross during its existence.

The flag of Barcelona combines the cross of Saint George, the patron saint of Catalonia, with the traditional red and yellow bars of the Senyera, the ancient symbol of the Crown of Aragon (here, the bars are vertical, though the modern flag of Catalonia has horizontal stripes). The flag of Almería, Spain, consist of a St George's Cross. The crest of Royal St. George's College in Toronto, Canada, contains a St George's Cross. The Indian naval flag used to feature a St. George Cross until it was removed in 2022
Both the flag of Sardinia and the flag of Corsica are derived from the Four Moors flag, also known as the "Cross of Alcoraz". This consists of a red cross of Saint George on a white background with a maure (moor's head) in each quarter. This is also found in the flag of Aragon, (Spain), and is based on a war flag of the Reconquista following the Battle of Alcoraz in 1096. The flag and arms of Freiburg im Breisgau, Germany, consist of a St George's Cross, as St George is one of the city's patron saints. In Sweden, the term "Saint George's cross" sometimes refers to the Cross pattée used by Swedish Freemasons. For example, the cross of the Swedish Order of Freemasons was defined by the King of Sweden in 1928 to be a "red St George's cross with triangular arms". In Finland, the Cross pattée is called Yrjön risti, "George's cross", while the red cross on a white background is called Pyhän Yrjön risti, "Saint George's cross". Some British Commonwealth countries used the St. George's Cross on their naval ensigns, including the Bahamas, Jamaica, Saint Kitts and Nevis, South Africa. The naval jack of Italy contains a St. George's Cross on the second quarter. Naval flags of Latvia, contain a St. George's Cross coloured in the same pattern as the Latvian national flag. Depicted on the trumpet banner of the Angel from the Judgement card in the Tarot Deck. The naval ensign of Ukraine contains a St. George's Cross.