The Roman Catholic Diocese of Osório () is a diocese located in the city of Osório in the ecclesiastical province of Porto Alegre in Brazil.

History 10 November 1999: Established as Diocese of Osório from the Diocese of Caxias do Sul and Metropolitan Archdiocese of Porto Alegre

Leadership Bishops of Osório (Roman rite) Bishop Thadeu Gomes Canellas (1999.11.10 – 2006.11.15) Bishop Jaime Pedro Kohl, P.S.D.P. (2006.11.15 – present)

References GCatholic.org Catholic Hierarchy Diocese website (Portuguese)