Diamantina may refer to:
Geography
Australia Diamantina Bowen (1833–1893), grande dame of Queensland and the wife of Sir George Bowen, the first Governor of Queensland. Diamantina Cocktail, 1976 album by Little River Band Diamantina National Park, Queensland Diamantina River, a river in Queensland and South Australia HMAS Diamantina, two ships in the Royal Australian Navy Shire of Diamantina, a local government area in Queensland
Brazil Chapada Diamantina, a region of Bahia state Diamantina, Minas Gerais, a municipality and UNESCO World Heritage Site
Elsewhere Diamantina fracture zone, Indian Ocean trench Diamantina Deep
Biology Diamantina (plant), a genus of plants in the family Podostemaceae
In fiction Diamantina, a fictional island in the Indian Ocean, in the animated television series Noah's Island