The Saint Vincent blacksnake (Chironius vincenti), also commonly known as the Saint Vincent coachwhip, the San Vincent racer, and Vincent's sipo, is a species of snake in the family Colubridae.
C. vincenti is endemic to Saint Vincent, an island in the Caribbean Lesser Antilles that is part of Saint Vincent and the Grenadines.
The specific name, vincenti, refers to the island of Saint Vincent.
C. vincenti can grow to lengths in excess of a meter (40 inches). It is slate black, with a paler mouth and ventral surface.
The preferred natural habitat of C. vincenti is forest, at elevations of .