William D'Arcy

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