The Roman Catholic Diocese of Castanhal (Latin: Dioecesis Castagnalensis de Pará) is a diocese located in the city of Castanhal in the ecclesiastical province of Belém do Pará in Brazil.

• December 29, 2004: Established as Diocese of Castanhal from the Metropolitan Archdiocese of Belém do Pará and Diocese of Bragança do Pará

• Bishops of Castanhal (Roman rite)
  • Bishop Carlos Verzeletti (December 29, 2004 – present)

• GCatholic.org
• Catholic Hierarchy

1°17′34″S 47°56′36″W / 1.2929°S 47.9432°W / -1.2929; -47.9432