奥马苏约斯省是玻利维亚的省份，位于该国西部，属于拉巴斯省的一部分，首府设于阿查卡奇，面积2,065平方公里，2012年人口84,484，人口密度每平方公里41人。

Omasuyos (hispanicized spelling) or Uma Suyu (Aymara uma water, suyu region, "water region") is a province in the La Paz Department in Bolivia. Its capital is Achacachi (Jach'a Q'achi).

The province is situated in the Altiplano bordered to the north by the Muñecas Province, to the northeast by the Larecaja Province, to the southeast by the Los Andes Province, to the south and west by Lake Titicaca and to the northwest by the Eliodoro Camacho Province.