DeCourcy, DeCourcey, De Courcy, or De Courcey is a surname. People with the surname include:
- DeCourcy/De Courcy
- Affreca de Courcy (late 12th-/early 13th century), noblewoman from the Kingdom of the Isles
- Alfred De Courcy (1866–1931), Birmingham whistle maker
- Anya De Courcy (born 1997), Trinidadian footballer
- Bob DeCourcy (1927–2012), Canadian professional ice hockey goaltender
- Brigie de Courcy (fl. 2000s–2010s), Irish television producer
- Charles DeCourcy (1857–1924), justice of the Massachusetts Supreme Judicial Court
- Frédéric de Courcy (1796–1862), French dramatist, poet and chansonnier
- Henri Roussel de Courcy (1827–1887), French divisional general
- Jim de Courcy (1927–2000), Australian cricketer
- John de Courcy (1150–1219), Anglo-Norman knight who arrived in Ireland in 1176
- William de Courcy (disambiguation), various people
- DeCourcey/De Courcey
See also