William Swan
William Swan is the name of the following people:
- William Swan (diplomat) (1619–1678), English diplomat
- William Swan, 1st Baronet (1631–1680), English nobleman
- William Swan, 2nd Baronet (1667–1712), English / British nobleman
- William Graham Swan (1821–1869), American lawyer and politician
- William Swan (actor) (born 1928), American actor
- William Lance Swan (born 1942), American country singer and songwriter, see Billy Swan