Thomas Marshall (baptised 9 January 1621 – 18 April 1685) was an English churchman and linguist, Rector of Lincoln College, Oxford and Dean of Gloucester.
He was educated first under Francis Foe, vicar of Barkby, matriculated at Oxford on 23 October 1640, as a batler of Lincoln College, and was Traps scholar from 31 July 1641 until 1648.
Oxford was garrisoned for the king and Marshall served in the regiment of Henry Carey, 1st Earl of Dover, at his own expense, so that he was excused fees when graduating B.A.
His Observations on Anglo-Saxon and Gothic versions of the gospel, which he published in 1665, led to his unsolicited election to a fellowship of Lincoln College on 17 December 1668.
He was rector of Bladon, near Woodstock, from May 1680 to February 1682, and was installed dean of Gloucester on 30 April 1681 In 1681 and 1684 he was one of the delegates for the chancellor of the university, James Butler, 1st Duke of Ormonde, who was absent in Ireland.
Marshall died suddenly in Lincoln College, about 11 P.M., on Easter Eve, 18 April 1685, and was buried in the chancel of All Saints' Church, Oxford.