Thomas Deacon, QC (November 7, 1832 – March 18, 1911) was an Ontario lawyer, judge, businessman and political figure.

He was born in Perth in Upper Canada in 1832, the son of John Deacon, an Irish immigrant.

He studied law with his brother John, was called to the bar in 1862 and went on to practise in Pembroke.

Deacon was a director of the Kingston and Pembroke Railway and president of a lumber company.

This article about an Ontario Progressive Conservative Party MPP is a stub.