Thomas Mears (c. 1775 – October 16, 1832) was a businessman and political figure in Upper Canada.
He set up a sawmill and gristmill on the Ottawa River in that area with David Pattee, which later became the basis for the town of Hawkesbury.
He was elected to the Legislative Assembly of Upper Canada for Prescott in 1808 and was reelected in 1812.
Mears also operated the first steamboat on the Ottawa River, the Union.
In 1819, Mears took over the operation of a sawmill originally built by Joseph Papineau on the Petite-Nation River near Plaisance in Lower Canada.