| Jurisdiction: | Territorial Prelature |
| São Félix | |
| Latin: | Praelatura Territorialis Sancti Felicis |
| Local: | Prelazia Territorial de São Félix |
| Country: | Brazil |
| Province: | Cuiabá |
| Rite: | Latin Rite |
| Established: | 13 May 1969 (years ago) |
| Cathedral: | Cathedral of the Assumption in São Félix do Araguaia |
| Area Km2: | 150,000 |
| Population: | 150,000 |
| Population As Of: | 2004 |
| Catholics: | 129,000 |
| Catholics Percent: | 86 |
| Bishop: | Lucio Nicoletto |
| Metro Archbishop: | Mílton Antônio dos Santos |
| Emeritus Bishops: | Adriano Ciocca Vasino |
| Map: | ProvinciaEclesiasticaCuiaba.jpg |
| Website: | Website of the Prelature |
The Territorial Prelature of São Félix (do Araguaia) (Latin: Praelatura Territorialis Sancti Felicis) is a Roman Catholic territorial prelature in the Brazilian state of Mato Grosso.
It is a suffragan in the ecclesiastical province of the Metropolitan of Archbishop of Cuiabá. Its cathedral see, Catedral Prelatícia Nossa Senhora da Assunção, is located in the city of São Félix do Araguaia.
On 21 March 2012, Pope Benedict XVI appointed as the Prelate of São Félix Bishop Adriano Ciocca Vasino, who had previously served as the Bishop of the Roman Catholic Diocese of Floresta in Pernambuco. Bishop Ciocca Vasino demissioned on 13 March 2024 and Pope Francis named as new bishop father Lucio Nicoletto