William D'Arcy or Darcy may refer to:
- Bill D'Arcy (William Theodore D'Arcy, born 1939), Queensland politician, accused and convicted of sexual abuse of children
- William Knox D'Arcy (1849–1917), furthered British interests in developing Persian (Iranian) oil
- William Alexander D'Arcy (1863–1940), cricketer from New Zealand
- Sir William Darcy (died 1540) (c. 1460–1540), Anglo-Irish statesman
This disambiguation page lists articles about people with the same name.
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