William Sinclair Kingan (6 December 1876 – 1946) was a unionist politician in Northern Ireland.
Kingan studied at Sunningdale School and Rugby School before working as a pork manufacturer.
[1] In 1924, he served as High Sheriff of Down.
[2] He joined the Ulster Unionist Party, and was elected to the Senate of Northern Ireland in 1940, serving until his death in 1946.
Most notably, he served as a Deputy Speaker of the Senate in 1945.