Darcy, Darci or Darcey may refer to:

• Darcy's law, which describes the flow of a fluid through porous material
• Darcy (unit), a unit of permeability of fluids in porous material
• Darcy friction factor in the field of fluid mechanics
• Darcy–Weisbach equation used in hydraulics for calculation of the head loss due to friction

• Darcy (surname), a surname (including a list of people with the name)

• Darci Afonso Jacobi Júnior (born 1979), Brazilian footballer
• Darcy Blake (born 1988), Welsh footballer
• Darcy Dallas (born 1972), Canadian ice hockey defenceman
• Darcy Cameron (born 1995), Australian rules footballer
• Darcy Daniher (born 1989), Australian rules footballer
• Darci Frigo, Brazilian activist
• Darcy Furber, Canadian politician
• Darcy Gardiner (born 1995), Australian rules footballer
• Darcy Hordichuk (born 1980), professional ice hockey player
• Darcy Kuemper (born 1990), professional ice hockey player
• Darcy Lang (born 1995), Australian rules footballer
• Darcy Lear (1898–1967), Australian rules footballer
• Darcy Lussick (born 1989), Australian rugby league player
• Darcy McDougall (1886–1952), Australian rules footballer
• Darci Menezes (born 1949), Brazilian footballer
• Darcy Moore (born 1996), Australian rules footballer
• Darci Luiz Simon (born 1966), Brazilian footballer
• Darci Miguel Monteiro (1968-2018), Brazilian footballer
• Darcy Requi Florêncio (1955–2024), Brazilian footballer
• Darcy Ribeiro, (1922–1997), Brazilian anthropologist and politician
• Darcy Tucker (born 1975), professional ice hockey player

• Darcey Bussell (born 1969), English ballerina
• Darci Lynne (born 2004), American singing ventriloquist
• Darci Kistler (born 1964), American ballet dancer
• Darcy LaPier (born 1965), American actress
• Darcy Sterling (born 1969), American actress

• Mr. Fitzwilliam Darcy, from Jane Austen's novel Pride and Prejudice
• Mark Darcy, from Helen Fielding's novel Bridget Jones's Diary
• Lord Darcy (character), a detective created by Randall Garrett
• Diane Darcy, racing car driver, in Herbie Goes to Monte Carlo
• Darcy Edwards, student on Degrassi: The Next Generation
• Darcy (Winx club), a witch from animated series Winx Club
• Darcy Doll, an android companion created by the Toyman in Superman: The Animated Series
• Darcy Hudson, a character in the Australian drama series A Country Practice
• Darcy Lewis, a character in the Marvel Cinematic Universe portrayed by Kat Dennings
• Darcy Wu, the nickname used by The Core when possessing Marcy Wu in the television series Amphibia
• Darcy, a tunnel-boring driller in the British educational TV show Thomas & Friends and its reboot, Thomas & Friends: All Engines Go!
• Darcy, in Richie Rich, played by Jenna Ortega

• Darcy v. Allein, the first court case to result in a judgement against monopoly
• Darci, a doll in the Groovy Girls line

• D'arcy (disambiguation)
• Darcie, a feminine given name
• Baron Darcy (disambiguation)
• All pages with titles beginning with Darcy