Thomas Mitchell March Tweedie (born: March 4, 1871 River John, Nova Scotia – died: October 4, 1944) was a politician, lawyer and Chief Justice in Canada.
Tweedie was born in River John, Nova Scotia in 1871. He attended Harvard University and graduated with a law degree in 1905. He joined the bar and started practicing law in 1907.
Tweedie was first elected to the Legislative Assembly of Alberta in a 1911 by-election and served the Calgary seat that had been previously vacated by Richard Bennett. In this elected he ran under the Conservative banner. Tweedie defeated popular municipal alderman Thomas Skinner who ran as a Liberal candidate.
Tweedie was re-elected to his second term in the 1913 Alberta general election. The Calgary riding was broken up into 3 different ridings under the redistribution bill passed by the Sifton government. Thomas ran in the new riding of Centre Calgary. He won his second term in the legislature with a large margin defeating Liberal candidate John McDougall.
In the 1917 Alberta general election he ran for re-election in Calgary Centre, this time being defeated by Alex Ross who ran as a Labor candidate. Thomas would quickly make the jump to federal politics running in the federal election later that year.
After Thomas lost his seat in the 1917 provincial election, he attempted a run at federal politics. Thomas ran as a Unionist member in the new Calgary West federal riding during the 1917 federal election. He won a comfortable victory and served as the first Member of Parliament for the riding in the coalition government.