The Roman Catholic Diocese of Itaguaí () is located in the ecclesiastical province of São Sebastião do Rio de Janeiro in Brazil.

History 14 March 1980: Established as Diocese of Itaguaí from the Diocese of Barra do Piraí–Volta Redonda and Diocese of Nova Iguaçu

Leadership Bishops of Itaguaí (Roman rite) Vital João Geraldo Wilderink, OCarm (1980.04.21 – 1998.07.08) José Ubiratan Lopes, OFMCap (1999.11.17 – 2023.04.19) Paulo Celso Dias do Nascimento (2023.04.19 – Present)

References GCatholic.org Catholic Hierarchy