For the 20th-century Belgian Byzantinologist, see Henri Grégoire (historian).

Henri Grégoire (; 4 December 1750 – 28 May 1831), often referred to as Abbé Grégoire, was a French Roman Catholic priest, constitutional bishop of Blois and a revolutionary leader. He was an ardent abolitionist and supporter of universal suffrage, and was a founding member of the Bureau des longitudes, the Institut de France, and the Conservatoire national des arts et métiers.