Sir Henry Belasyse KB (c. 1639 – August 1667) was an English army officer and Member of the Parliament of England.
Belasyse was captain of foot in the garrison of Hull in 1660–1662 and from 1665 to his death, as well as holding a lieutenant's commission for a few months during 1666 in the Duke of Buckingham's Regiment of Horse.
Nine months later he was killed in a duel following a drunken quarrel with a close friend, the dramatist Thomas Porter.
[1] Samuel Pepys described the episode at length in his Diary,[2] and commented that it was the silliest and most trivial quarrel imaginable: "the world doth talk of them as a couple of fools".
[3] He married Susan, daughter and co-heiress of Sir William Armine, 2nd Baronet, and Anne Crane: they had one son, Henry.