William Aitken or Bill Aitken may refer to:
William Aitken (architect) (1889–1961), Scottish-American architect William Aitken (politician) (1903–1964), journalist and politician William Alexander Aitken (1785–1851), fur trader with the Ojibwe William Aubrey Aitken (1911–1985), second Bishop of Lynn, 1972–1986 William Aitken (pathologist) (1825–1892), Scottish pathologist Bill Aitken (politician) (born 1947), Scottish politician Bill Aitken (writer) (1934–2025), Scottish-born writer and traveller, long a citizen and resident of India Billy Aitken (footballer) (1894–1973), Scottish football player