Thomas Greaves (1612–1676) was an English orientalist, a contributor to the London Polyglot of Brian Walton.
He was educated at Charterhouse School, and was admitted scholar of Corpus Christi College, Oxford, 1627, becoming fellow in 1636, and deputy-reader of Arabic 1637.
He made a deposition in 1648 on behalf of his brother, John Greaves, who was ejected from his professorship at Merton College.
He was obliged to resign this rectory some years before his death on account of an impediment in his speech.
He contemplated a Treatise against Mahometanism, as appears from a letter to his friend Richard Baxter.