Henry Plummer (1832–1864) was a prospector, lawman, and outlaw in the American West.

Henry Plummer may also refer to:

Henry Stanley Plummer (1874–1936), internist and endocrinologist who co-founded the Mayo Clinic Henry V. Plummer (1844–1905), Baptist preacher and chaplain with the US Army Buffalo soldiers H. Vinton Plummer (1876–?), American lawyer and civil rights activist Henry Crozier Keating Plummer (1875–1946), English astronomer Henry Waite Plummer (1771–1847), planter, slave-owner and politician in Jamaica

See also Henry P. Cheatham (Henry Plummer Cheatham, 1857–1935), educator, farmer and politician from North Carolina Henry Plumer McIlhenny (1910–1986), American connoisseur of art and antiques, curator and chairman of the Philadelphia Museum of Art Harry Plummer (disambiguation)