| Jurisdiction: | Diocese |
| Cristalândia | |
| Latin: | Dioecesis Cristalandiensis |
| Country: |  Brazil |
| Rite: | Latin Rite |
| Established: | 26 March 1956 (years ago) |
| Cathedral: | Catedral Prelatícia Nossa Senhora do Perpétuo Socorro |
| Area Km2: | 62,691 |
| Population: | 245,020 |
| Population As Of: | 2019 |
| Catholics: | 138,750 |
| Catholics Percent: | 56.6 |
| Metro Archbishop: | Pedro Brito Guimarães |
| Bishop: | Wellington de Queiroz Vieira |
| Map: | Tocantins Municip Cristalandia.svg |
| Coordinates: | -10.6°N -49.1928°W |
| Website: | www.prelaziadecristalandia.com.br |
The Roman Catholic Diocese of Cristalândia (Latin: Dioecesis Cristalandiensis) is a diocese in the ecclesiastical province of Palmas in central Brazil.
Its episcopal cathedral is the Marian Catedral Prelatícia Nossa Senhora do Perpétuo Socorro, dedicated to Our Lady of Perpetual Support, in the city of Cristalândia in the Amazonian state of Tocantins. It comprises municipalities in southwest Tocantins and five in northwest Goiás state.
As per 2015, it pastorally served 176,700 Catholics (80.0% of 221,000 total) on 62,691 km2 in 17 parishes and 80 missions with 20 priests (16 diocesan, 4 religious), 1 deacon, 25 lay religious (5 brothers, 20 sisters) and 2 seminarians.
As per 10 July 2019, in time of modification, it pastorally served 138,750 Catholics (56.6% of 245,020 total) on 62,691 km2 in 17 parishes and 80 missions with 19 priests (17 diocesan, 2 religious), no deacons, 25 lay religious (2 brothers, 23 sisters) and 10 seminarians.
(all Roman rite; initially members of missionary Latin congregations)