Henri Jean-Baptiste Grégoire, often referred to as the Abbé Grégoire, was a French Catholic priest, constitutional bishop of Blois and a revolutionary leader. He was an ardent slavery abolitionist and supporter of universal suffrage. He was a founding member of the Bureau des longitudes, the Institut de France, and the Conservatoire national des arts et métiers.

Blois is a commune and the capital city of Loir-et-Cher department, in Centre-Val de Loire, France, on the banks of the lower Loire river between Orléans and Tours.