William Keith may refer to:
Law and politics William John Keith (1873–1937), British colonial administrator William Keith (Canadian politician) (fl. 1920s), Canadian politician in Ontario William R. Keith (1929–2009), American businessman and politician in Michigan William Keith (Louisiana politician) (born 1934), American politician in Louisiana
Nobility William Keith, 1st Earl Marischal (died 1483), Scottish peer and politician William Keith, 4th Earl Marischal (died 1581), Scottish nobleman and politician William Keith, 6th Earl Marischal (c. 1585–1635), Scottish peer and naval officer William Keith, 7th Earl Marischal (1610–1670/71), Scottish Covenanter William Keith, 9th Earl Marischal (c. 1664–1712), Scottish Jacobite politician Sir William Keith, 4th Baronet (1669–1749), Lt. Governor of Pennsylvania and Delaware William Keith, 2nd Earl of Kintore (1695–1718), Scottish nobleman
Others William Keith of Galston (died 1336), Scottish soldier William Keith of Delny (died c. 1605), Scottish courtier William Keith (artist) (1838–1911), American landscape artist William Keith (footballer) (fl. 1913–1916), Scottish footballer William Keith (athlete) (1925–1999), South African Olympic runner William H. Keith Jr. (born 1950), American science fiction author
See also Bill Keith (disambiguation) Keith Williams (disambiguation)