William Aitken
William Aitken or Bill Aitken may refer to:
- William Aitken (architect), Scottish-American architect
- William Aitken (politician), journalist and politician
- William Alexander Aitken, fur trader with the Ojibwe
- William Aubrey Aitken, second Bishop of Lynn, 1972–1986
- William Aitken (pathologist), Scottish pathologist
- Bill Aitken (politician), Scottish politician
- Bill Aitken (writer), Scottish-born writer and traveller, long a citizen and resident of India
- Billy Aitken (footballer), Scottish football player