The slave ship Mary departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Dominica.

Vessel: Mary; flag: Great Britain; rig: Ship; estimated standardized tonnage: 293. People recorded in connection with the voyage: Captain: Harding, William; Investor: Harding, William; Investor: Dickson, William. The voyage began at Liverpool on 23 July 1791. Principal recorded place where captives were acquired: Bonny (Bight of Biafra and Gulf of Guinea islands). Principal recorded disembarkation place: Dominica, place unspecified. Estimated mortality during the crossing: 8.0%. Recorded outcome: Voyage completed as intended.