William Roy (disambiguation)

William Roy (1726–1790) was a Scottish military engineer, surveyor, and antiquarian.

William Roy may also refer to:


 * William R. Roy (1926–2014), United States Representative from Kansas
 * Bill Roy Jr. (born 1954), American member of the Kansas state legislature and son of William R. Roy
 * William Roy (medium) (1911–1977), notorious fraud medium in the history of British spiritualism
 * William Burton Roy (born 1958), retired USAF officer and Olympian sport shooter