Thomas Mabon Radenhurst, QC (April 6, 1803 – August 7, 1854) was a lawyer and political figure in Upper Canada.
He was called to the bar in 1824 and then moved to Perth, the judicial seat of the Bathurst District.
In 1828, he was elected to the 10th Parliament of Upper Canada representing Carleton County.
In 1830, he fought a duel with another Perth lawyer, James Boulton; neither party was seriously injured.
In 1833, Robert Lyon, Radenhurst's student, and John Wilson, Boulton's student, fought the last fatal duel in Canada; Lyon died on June 13, 1833.