Thomas Quin Ashburn (February 9, 1820 – January 17, 1890) was an American judge on the Supreme Court Commission of Ohio from 1876 to 1879, and a member of the Ohio State Senate for twelve days at the end of his life in 1890. Thomas Ashburn was born at East Walnut Hills, Cincinnati, Ohio. He was the oldest of seven children of Richard Ashburn and Mary (Williams) Ashburn. The family soon moved to New Richmond, Clermont County, Ohio, where Thomas grew up.