| Jurisdiction: | Diocese |
| Formosa | |
| Latin: | Dioecesis Formosensis |
| Local: | Diocese de Formosa |
| Country: |  Brazil |
| Rite: | Latin Rite |
| Established: | 26 March 1956 (years ago) |
| Cathedral: | Cathedral of the Immaculate Conception in Formosa, Goiás |
| Area Km2: | 47,604 |
| Population: | 366,900 |
| Population As Of: | 2016 |
| Catholics: | 262,100 |
| Catholics Percent: | 71.4 |
| Bishop: | Adair José Guimarães |
| Metro Archbishop: | Sérgio da Rocha |
| Emeritus Bishops: | José Ronaldo Ribeiro |
| Map: | DiocesisGoiasDistritoFederal.jpg |
The Roman Catholic Diocese of Formosa (la|Dioecesis Formosensis) is a Latin suffragan diocese in the ecclesiastical province of Brasília in central Brazil.
Its cathedral episcopal see is Catedral Nossa Senhora da Imaculada Conceição, dedicated to Our Lady of the Immaculate Conception, in the city of Formosa, in the state of Goiás, central Brazil.
As per 2014, it pastorally serves 256,900 Catholics (73.5% of 349,500 total) on 47,604 km2 in 27 parishes and 240 missions with 37 priests (diocesan), 52 lay religious (4 brothers, 48 sisters) and 14 seminarians.
(all Roman rite)