Sir Henry Belasyse (1648 – 14 December 1717), also spelt Bellasis, was an English military officer from County Durham, who also sat as MP for a number of constituencies between 1695 and 1715. Beginning his military career in 1674 under William of Orange, he proved an effective soldier who was trusted with a variety of senior commands, but was unpopular with his contemporaries. In the Glorious Revolution of November 1688, he helped secure the north of England for William, before fighting in Ireland and Flanders in the 1688 to 1697 Nine Years War.