The slave ship John arrived with enslaved Africans in Dominica. About 290 people had been taken aboard and approximately 261 arrived.

Vessel: John; flag: Great Britain; rig: Ship; estimated standardized tonnage: 287. People recorded in connection with the voyage: Investor: McDowal, Samuel; Investor: Twemlow, Thomas; Captain: King, Charles. The voyage began at Liverpool on 8 March 1803. Principal recorded place where captives were acquired: Gorée (Senegambia and offshore Atlantic). Principal recorded disembarkation place: Dominica, place unspecified. Recorded outcome: Captured before disembarking enslaved people; vessel recaptured or released subsequently.