Celebrations
- 1950.12.21: Established as Apostolic Vicariate of Fort-Rousset / Arcis Rousset (Latin) (from Apostolic Vicariate of Brazzaville)
- 1955.09.14: Promoted as Diocese of Fort-Rousset / Arcis Rousset (Latin) (became suffragan of Brazzaville)
- 1977.12.03: Renamed as Diocese of Owando / Ouandoën(sis) (Latin)
- 1983.06.06: Lost territory to establish Diocese of Ouesso
- 2013.02.22: Lost territory to establish Diocese of Gamboma
- 2020.05.30: Promoted as Metropolitan Archdiocese of Owando / Ouandoën(sis) (Latin) (with suffragan sees Impfondo and Ouesso)
Statistics (2022.12.31)
Area: 74,850 km²
Population: 373,000 Catholics (73.1% of 510,000 total)
Pastoral Centres: 19 parishes, 1 mission
Personnel: 54 priests (49 diocesan, 5 religious), 1 deacon, 76 religious (44 brothers, 32 sisters), 18 seminarians
