| Jurisdiction: | Diocese |
| Tianguá | |
| Latin: | Dioecesis Tianguensis |
| Local: | Diocese de Tianguá |
| Country: | Brazil |
| Rite: | Latin Rite |
| Coordinates: | -3.7201°N -40.9908°W |
| Area Km2: | 9,680 |
| Population: | 445,000 |
| Population As Of: | 2010 |
| Catholics: | 409,000 |
| Catholics Percent: | 91.9 |
| Bishop: | Francisco Edimilson Neves Ferreira |
| Metro Archbishop: | José Antônio Aparecido Tosi Marques |
| Emeritus Bishops: | Francisco Javier Hernández Arnedo, O.A.R. |
The Roman Catholic Diocese of Tianguá (Latin: Dioecesis Tianguensis) is a diocese located in the city of Tianguá in the ecclesiastical province of Fortaleza in Brazil.