Saint George's Day is the feast day of Saint George. It is 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 Saint George's death in AD 303.

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For Eastern Orthodox Churches which use the Julian calendar, 23 April corresponds to 6 May on the Gregorian calendar.
As Easter often falls close to Saint George's Day, the church celebration of the feast may be moved from 23 April. In England, where it is observed as a solemn feast, for 2011 and 2014 the Anglican and Catholic calendars celebrate Saint George's Day on the first Monday after Easter Week (2 May and 28 April, respectively). Similarly, the Eastern Orthodox celebration of the feast moves accordingly to the first Monday after Easter or, as it is sometimes called, to the Monday of Bright Week.