Lieutenant-General Sir Charles Montagu KB (died 1 August 1777) was a British Army officer. He was the son of Brigadier-General Edward Montagu, colonel of the 11th Foot and Governor of Hull, nephew of George Montagu, 1st Earl of Halifax, and great-nephew to the celebrated minister Charles Montagu, 1st Earl of Halifax. He had an elder brother, Edward, who was killed at the Battle of Fontenoy, being then lieutenant-colonel of the 31st Foot.