The Roman Catholic Diocese of Barra do Piraí–Volta Redonda (Latin: Dioecesis Barrensis de Pirai–Voltaredondensis) is a diocese located in the cities of Barra do Piraí and Volta Redonda in the ecclesiastical province of São Sebastião do Rio de Janeiro in Brazil.

• 4 December 1922: Established as Diocese of Barra do Piraí from the Diocese of Niterói
• 26 January 1965: Renamed as Diocese of Barra do Piraí–Volta Redonda

• Bishops of Barra do Piraí (Latin Rite)
  • Guilherme Müller (1925.12.14 – 1935.12.11)
  • José André Coimbra (1938.02.26 – 1955.06.08), appointed Bishop of Patos de Minas, Minas Gerais
  • Agnelo Rossi (1956.03.05 – 1962.09.06), appointed Archbishop of Ribeirão Preto, São Paulo; future Cardinal
  • Altivo Pacheco Ribeiro (1963.04.04 – 1965.01.26)
• Bishops of Barra do Piraí-Volta Redonda (Latin Rite)
  • Altivo Pacheco Ribeiro (1965.01.26 – 1966.06.27), appointed Bishop of Araçuaí (Arassuaí), Minas Gerais
  • Waldyr Calheiros Novaes (1966.10.20 – 1999.11.17)
  • João Maria Messi, O.S.M. (1999.11.17 – 2011.06.08, retired)
  • Francesco Biasin (2011.06.08 – 2013.03.13)
  • Luiz Henrique da Silva Brito (2013.03.13 - present)

• Vital João Geraldo Wilderink, O. Carm. (1978-1980), appointed Bishop of Itaguaí, Rio de Janeiro

• GCatholic.org
• Catholic Hierarchy
• Diocese website (Portuguese) Archived 2012-02-13 at the Wayback Machine

22°27′53″S 43°49′54″W / 22.4647°S 43.8316°W / -22.4647; -43.8316