Aușeu (Hungarian: Kisősi, Slovak: Aušeu) is a commune in Bihor County, Crișana, Romania with a population of 3,033 people.

It is composed of six villages: Aușeu, Cacuciu Vechi (Kiskakucs), Codrișoru (Szekatura), Gheghie (Körösgégény), Groși (Tőtös), and Luncșoara (Élesdlok).

It lies on the banks of the Crișul Repede River, at the confluence with its right tributaries, Borod, Pârâul Omului, and Gepiș.

At the end of World War I, the estate was bought by Gheorghe Mateescu, a boyar from Muntenia.

After World War II, the castle was nationalized by the Communist regime; from 1950 to 2006, it served as a sanatorium for tuberculosis patients.