William Fairfax (disambiguation)
William Fairfax (1691–1757) was the builder of the Belvoir estate and plantation. William Fairfax may also refer to:

William Fairfax (died 1514), Justice of the Common Pleas
William Fairfax (died 1597), MP for Boroughbridge and Yorkshire
William Fairfax (soldier) (1609–1644)
William George Fairfax (1739–1813), vice-admiral in the Royal Navy
Sir William George Herbert Taylor Ramsay-Fairfax, 2nd Baronet (1831–1902), of the Fairfax Baronets

See also
George William Fairfax, planter