The slave ship Polly left the African coast carrying enslaved Africans toward Saint Vincent and the Grenadines. About 300 people had been taken aboard.

Vessel: Polly; flag: Great Britain; rig: Ship; estimated standardized tonnage: 161. People recorded in connection with the voyage: Captain: Spellen, John. The voyage began at Barbados, place unspecified on 1788. Principal recorded place where captives were acquired: Cape Coast Castle (Gold Coast). Principal recorded disembarkation place: St Vincent, port unspecified. Estimated mortality during the crossing: 62.0%. Recorded outcome: Abandoned or condemned for unseaworthiness in the Americas.