Didier is a French name. It comes from the Ancient Roman name Didius.
During the 5th century AD, with the Christianisation of ancient pagan names, it was decided to associate a new Latin translation to this name: Desiderius, related to Latin desiderium, meaning "ardent desire".
The name may also refer to:
In people given names:
- Didier Ratsiraka, a former President of Madagascar, serving two terms, from 1975 to 1993 and from 1997 to 2002
- Didier Marouani, a French musician, founder of music group "Space".
- Didier of Cahors (c. 580–655), Desiderius or (saint) Didier, French saint
- Desiderius (8th century), last king of the Lombards
In people surnames:
- Candice Didier (b. 1988), French figure skater
- Charles A. Didier (b. 1935), Belgian Mormon leader
- Clint Didier (b. 1959), U.S. politician and former football tight end in the NFL
- Daniel J. Didier (b. 1945), Judge - Orange County, CA. Superior Court
- F.O. "Potch" Didier (1919–2007), Louisiana sheriff who once spent seven days in his own jail upon conviction of malfeasance in office
- John Peter Didier (1748–1823), U.S. politician, first State Treasurer of Missouri
- Didier & Co., New York publisher of the late 1940s P. G. Wodehouse novels Uncle Dynamite and The Mating Season
- Didier (film), a 1997 French film