Thomas Thwing was a 17th-century English Catholic priest who served the English Mission for approximately fourteen years. Born in York to a recusant family, he was educated at St Omer and the English College in Douai. He acted as a chaplain at Carlton Hall and later at Heworth Manor, where he was eventually arrested. He was executed in York in 1680 after being falsely accused of involvement in the Barnbow Plot, a conspiracy fabricated during the era of the Popish Plot.