William Thompson (22 January 1862 – 6 October 1937) was an Australian politician.
He was born in Queanbeyan to surveyor James Banford Thompson and Margaret Carroll.
From 1878 to 1885 he was a clerk in the Colonial Architect's office, before becoming a quantity surveyor and moving to Ryde in 1898.
He owned a horse farm on the Hawkesbury River and was a founder of the William Thompson Masonic School at Baulkham Hills, New South Wales, which operated from 1922 to 1972, and the New South Wales Masonic Schools Welfare Fund which, as A Start in Life, continues to assist indigent youth.
[1] In 1913 he was elected to the New South Wales Legislative Assembly as the Liberal member for Ryde, serving until his retirement in 1920.