Sir William Jenkins (25 July 1904 – January 1983) was a unionist politician in Northern Ireland.

Jenkins studied at the Belfast College of TechnologyKelly's handbook to the titled, landed and official classes, Vol. 95, p.1095 then worked in Bombay from 1931 to 1956 as the director of a tea company. He then returned to Northern Ireland, where he held numerous directorships, but also found time to sit on the Belfast Corporation as an Ulster Unionist Party member. He served as Lord Mayor of Belfast from 1963 to 1966.John F. Harbinson, The Ulster Unionist Party, 1882-1973, p.208

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