The slave ship Mary left the African coast carrying enslaved Africans toward Grenada. About 265 people had been taken aboard.

Vessel: Mary; flag: Great Britain; rig: Ship; estimated standardized tonnage: 171. People recorded in connection with the voyage: Captain: Tarleton, John; Investor: Tarleton, John; Captain: Tarleton, Thomas; Investor: Tarleton, Thomas; Captain: Robinson, John; Investor: Robinson, John; Investor: Tarleton, Clayton; Investor: Backhouse, Dan; Captain: Harrocks, James. The voyage began at Liverpool on 10 September 1790. Principal recorded place where captives were acquired: Bight of Biafra and Gulf of Guinea Islands, port unspecified. Principal recorded disembarkation place: Grenada, place unspecified. Estimated mortality during the crossing: 17.0%. Recorded outcome: Voyage completed as intended.