Thomas Herbert Lennox (August 7, 1869 – May 3, 1934) was an Ontario lawyer and political figure. He represented York North in the Legislative Assembly of Ontario from 1905 to 1923 and in the House of Commons of Canada from 1926 to 1934 as a Conservative member. In the 1925 federal election in York North, Lennox defeated Liberal Prime Minister William Lyon Mackenzie King. King was later elected in a by-election held in the Prince Albert riding in Saskatchewan.