Thomas Montagu, 4th Earl of Salisbury (c. 1388–1428), was an English nobleman and military leader during the late medieval period. He was a prominent figure in the Hundred Years' War, serving as a commander for the English forces. Montagu was known for his strategic skills and played a significant role in various battles, including the Battle of Agincourt in 1415. As a member of the Montagu family, he inherited the title of Earl of Salisbury from his father, John Montagu, 3rd Earl of Salisbury. Montagu's contributions to English politics and military affairs were notable during a time of conflict and change in England and France. His legacy continued through his descendants, who remained influential in English history.