The Roman Catholic Diocese of Guajará-Mirim () is a diocese located in the city of Guajará-Mirim in the ecclesiastical province of Porto Velho in Brazil.
History 1 March 1929: Established as Territorial Prelature of Guajará-Mirim from Territorial Prelature of Porto Velho and Diocese of São Luíz de Cáceres 16 October 1979: Promoted as Diocese of Guajará-Mirim
Bishops Ordinaries, in reverse chronological order Bishops of Guajará-Mirim (Roman rite), below Bishop Benedito Araújo (2011.12.09 – 2025.11.07), appointed Bishop of Campo Maior Bishop Geraldo João Paulo Roger Verdier (1980.07.31 – 2011.12.09) Prelates of Guajará-Mirim (Roman Rite), below Bishop Luiz Roberto Gomes de Arruda, T.O.R. (1966.03.12 – 1978.11.03) Bishop Francisco Xavier Elias Pedro Paulo Rey, T.O.R. (1945.05.19 – 1966.03.12)
Coadjutor bishops Luiz Roberto Gomes de Arruda, T.O.R. (1964-1966), as Coadjutor Prelate Benedito Araújo (2011)
Auxiliary bishop José María Pinheiro (1997-2003), appointed Auxiliary Bishop of São Paulo
References GCatholic.org Catholic Hierarchy Diocese website (Portuguese)