The FA Sunday Cup is a knock-out amateur competition founded in 1964 for English Sunday league football teams.

Sunday league football in England consists of a series of leagues of amateur football clubs that play matches on Sundays. Most Sunday leagues across England consist of multiple divisions including promotion and relegation, but are not part of the English football league system. Every Sunday League operates under the jurisdiction of the local county association. Since 1964, all the Sunday Leagues have been under the auspices of the Football Association and their clubs are eligible to compete in the FA Sunday Cup and the local county cups.