William Finlayson

William Finlayson may refer to:
 * William Finlayson (Australian politician) (1867–1955), Member of the House of Representatives for the seat of Brisbane 1910–1919
 * William Finlayson (Canadian politician) (1875–?), lawyer and political figure in Ontario
 * William Finlayson (churchman) (1813–1897), churchman and farmer in the colony of South Australia