The slave ship Mary departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Saint Vincent and the Grenadines.

Vessel: Mary; flag: Great Britain; rig: Brig; estimated standardized tonnage: 139. People recorded in connection with the voyage: Investor: Ingram, F; Investor: Butler, Chris; Captain: Rigby, James; Investor: Rigby, James. The voyage began at Liverpool on 7 May 1791. Principal recorded place where captives were acquired: Bight of Benin, place unspecified. Principal recorded disembarkation place: St Vincent, port unspecified. Estimated mortality during the crossing: 7.0%. Recorded outcome: Voyage completed as intended.