Saint George's Day, also known as the Feast of Saint George, is the feast day of Saint George as celebrated by various Christian Churches and by the several nations, kingdoms, countries, and cities of which Saint George is the patron saint.

Saint George's Day is celebrated on 23 April, the traditionally accepted date of the saint's death in the Diocletianic Persecution of AD 303. For those Eastern Orthodox Churches which use the Julian calendar, this date currently falls on 6 May of the Gregorian calendar. In the 19th century, it was 5 May.

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