Thomas Roberts Ferguson (December 1818 – September 15, 1879) was an Ontario businessman and political figure.

In 1858, he was elected to represent South Simcoe in the Legislative Assembly of the Province of Canada and served until Confederation.

Ferguson also served as an officer in the local militia and became a lieutenant-colonel in 1865, participating in the defense against the Fenian raids.

He was elected to both the Ontario legislature and the House of Commons (Cardwell in 1867 and was re-elected by acclamation to the provincial assembly in 1872.

In the same year, he was struck on the head while attempting to stop a fight at a political meeting at Bradford and was forced to resign his seat in 1873 due to incapacity.