Oyasu Onsen (湯沢市小安温泉スキー場) is a ski resort located in Yuzawa, Akita Prefecture, Japan. It was known for its hot springs and ski area, but unfortunately, it permanently closed in 2018. The resort offered a variety of ski trails, with a total length of 275 km and 81 ski lifts. Visitors could also enjoy the hot springs and relax in the nearby town. The resort was accessible by bus from Yuzawa JR Station on the Ou Line.