Thomson Mason (14 August 1733 – 26 February 1785) was a prominent Virginia lawyer, jurist, and Chief Justice of the Supreme Court of Virginia. Mason was a younger brother of George Mason IV, United States patriot, statesman, and delegate from Virginia to the U.S. Constitutional Convention, father of Stevens Thomson Mason, a Colonel in the Continental Army during the American Revolutionary War, a member of the Virginia state legislature, and a U.S.