William Douglass
William Douglass may refer to:
- William Douglass (abolitionist), American abolitionist and church community leader
- William Douglass (engineer, born 1831), engineer-in-chief for Trinity House and later for the Commissioners of Irish Lights
- William Douglass (engineer), Chief Engineer for the Commissioners of Irish Lights
- William Douglass (physician), physician and pamphleteer in Boston
- Bill Douglass, American jazz drummer
- Klondike Douglass, American Major League Baseball player
- William Boone Douglass, lawyer, engineer, surveyor and genealogist