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.

He was born in Innisfil Township, Simcoe County, Ontario, the son of Thomas Lennox, an Irish immigrant, and was educated in Barrie and at Osgoode Hall. In 1894, he married Louise Meeking. He served three years on the town council and six years on the school board for Aurora. Lennox was also president of the Canadian Lacrosse Association. He was appointed a Patron of the Canadian Soccer Association, then known as the Dominion of Canada Football Association. He served as a lieutenant-colonel with the 208th Battalion, an Irish Canadian unit that he helped organize, during World War I. Lennox died in office in 1934.

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.

v t e 1925 Canadian federal election: York North
Party	Candidate	Votes	%	Elected
	Conservative	Thomas Herbert Lennox	10,028	51.26	Y
	Liberal	William Lyon Mackenzie King	9,534	48.74
Total valid votes			19,562	100.00
Source(s) "York North, Ontario (1867-08-06 - 2004-05-22)". History of Federal Ridings Since 1867. Library of Parliament. Retrieved 24 March 2020.