St. Stephen's Day, or the Feast of St. Stephen, is a Christian saint's day celebrated on 26 December in the Western Church and 27 December in the Eastern Church. Many Eastern Orthodox churches adhere to the Julian calendar and mark St. Stephen's Day on 27 December according to that calendar, which places it on 9 January of the Gregorian calendar used in secular contexts. It commemorates St. Stephen, the first Christian martyr or protomartyr. It is an official public holiday in Austria, Balearic Islands, Catalonia, Croatia, Czech Republic, Germany, Ireland, Italy, Luxembourg, Macedonia, Montenegro, Norway, Denmark, Estonia, Sweden, Finland, Romania, Serbia, Slovakia and Poland. The date is also a Public Holiday in those countries that celebrate Boxing Day on the day instead/as well.

In Ireland, the day is one of nine official public holidays.^[1]