The slave ship União arrived with enslaved Africans in Brazil. About 327 people had been taken aboard and approximately 297 arrived.

Vessel: União; flag: Portugal / Brazil; rig: Sumaca; estimated standardized tonnage: 118. People recorded in connection with the voyage: Captain: Rios, Marcelino Álvares da Cruz; Investor: Rios, Marcelino Álvares da Cruz; Captain: Cruz, Marcelino Álvares da; Captain: Martins, Marcelino. The voyage began at Bahia, place unspecified on 29 April 1822. Principal recorded place where captives were acquired: Popo (Bight of Benin). Principal recorded disembarkation place: Bahia, place unspecified. Recorded duration of the captives' Atlantic crossing: 25 days. Recorded outcome: Voyage completed as intended.