The Roman Catholic Diocese of Umuarama (Latin: Dioecesis Umuaramensis) is a diocese located in the city of Umuarama in the ecclesiastical province of Maringá in Brazil.

• 26 May 1973: Established as Diocese of Umuarama from the Diocese of Campo Mourão

• Bishops of Umuarama (Roman rite)
  • José Maria Maimone, S.A.C. (12 June 1973 - 8 May 2002) Resigned
  • Vicente Costa (9 October 2002 - 30 December 2009) appointed, Bishop of Jundiaí, São Paulo
  • João Mamede Filho, O.F.M. Conv. (24 November 2010 – present)

• Frederico Heimler, S.D.B. (1998-2002), did not succeed to see; appointed Bishop of Cruz Alta, Rio Grande do Sul

• GCatholic.org
• Catholic Hierarchy
• Diocese website (Portuguese) Archived 2016-10-07 at the Wayback Machine