William Blount, 4th Baron Mountjoy (c. 1478 – 8 November 1534), KG, of Barton Blount, Derbyshire, was an extremely influential English courtier, a respected humanistic scholar and patron of learning. He was one of the most influential and perhaps the wealthiest English noble courtier of his time. Mountjoy was known internationally as a humanist writer and scholar and patron of the arts.