The Roman Catholic Archdiocese of Porto Velho (Latin: Archidioecesis Portus Veteris) is an archdiocese located in the city of Porto Velho in Brazil.

• 1 May 1925: Established as Territorial Prelature of Porto Velho from the Diocese of Amazonas and Diocese of São Luíz de Cáceres
• 16 October 1979: Promoted as Diocese of Porto Velho
• 4 October 1982: Promoted as Metropolitan Archdiocese of Porto Velho

• Archbishops of Porto Velho (Latin Rite), below
  • Roque Paloschi (2015.10.14 - )
  • Esmeraldo Barreto de Farias, Ist. del Prado (2011.11.30 - 2015.03.18), appointed Auxiliary Bishop of São Luís do Maranhão
  • Moacyr Grechi, O.S.M. (1998.07.29 – 2011.11.30)
  • José Martins da Silva, S.D.N. (1982.10.04 – 1997.09.03)
• Bishop of Porto Velho (Latin Rite), below
  • João Batista Costa, S.D.B. (see below 1979.10.16 – 1982.06.09)
• Prelates of Porto Velho (Latin Rite), below
  • João Batista Costa, S.D.B. (1946.10.01 – 1979.10.16 see above)
  • Pedro Massa, S.D.B. (Apostolic Administrator 1925.07.25 – 1946.10.01)

• Antônio Sarto, S.D.B. (1971-1982, including 1971-1979 as Coadjutor Prelate), did not succeed to see; appointed Bishop of Barra do Garças, Mato Grosso

• Antônio Fontinele de Melo, appointed Bishop of Humaitá, Amazonas in 2020

• Diocese of Cruzeiro do Sul
• Diocese of Guajará-Mirim
• Diocese of Humaitá
• Diocese of Ji-Paraná
• Diocese of Rio Branco
• Territorial Prelature of Lábrea

• GCatholic.org
• Catholic Hierarchy

8°45′S 63°54′W / 8.750°S 63.900°W / -8.750; -63.900