The Roman Catholic Diocese of Joaçaba (Latin: Dioecesis Ioassabensis) is located in the ecclesiastical province of Chapecó, in Santa Catarina state, Brazil. The seat of the diocese is the Cathedral of St. Therese of the Child of Jesus, Joaçaba. It is bordered by the Catarinense dioceses of Chapecó, Caçador and Lages, as well as the dioceses of Erexim and Vacaria on the south and the diocese of Palmas–Francisco Beltrão on the north.

• 12 June 1975: Established from the dioceses of Caçador, Chapecó and Lages.

• Bishops of Joaçaba (Roman rite)
  • Mario Marquez, OFMCap (2010.12.22 – present); formerly Auxiliary bishop of the Diocese of Vitoria, Brazil
  • Walmir Alberto Valle, IMC (2003.04.09 – 2010.04.14)
  • Osório Bebber, OFMCap (1999.03.17 – 2003.04.09)
  • Henrique Müller, OFM (1975.06.27 – 1999.03.17)

• Walmir Alberto Valle, IMC (2002-2003)

• GCatholic.org
• Catholic Hierarchy

27°10′33″S 51°30′16″W / 27.1758°S 51.5045°W / -27.1758; -51.5045