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.

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