The Urbasa Range (Urbasa mendilerroa in Basque and Sierra de Urbasa in Spanish) is a mountain range of western Navarre, Spain, part of the Basque Mountains. Its highest point is the 1,183 metres high Baiza. Urbasa is a karstic range where numerous nummulites fossils have been found.Together with the neighboring Andia range, Urbasa is part of the Urbasa-Andia Natural Park.