Thomas Montagu, 3rd Earl of Salisbury (c. 1388–1428), was an English nobleman and military leader during the early 15th century. He was a prominent figure in the Hundred Years' War and served as a commander in several key battles, including the Battle of Agincourt in 1415. As a member of the House of Montagu, he played a significant role in the politics of his time. Salisbury was also known for his contributions to the English court and his involvement in the governance of the realm. He held various positions, including serving as a member of the Privy Council. His legacy includes his efforts in military campaigns and his influence on the political landscape of England during the Lancastrian period.