Ajigasawa is in Nishitsugaru District, Aomori southwestern corner of Aomori Prefecture on the border with Akita Prefecture, facing the Sea of Japan to the northwest, and the slopes of Mount Iwaki to the southeast. Part of the town is located within the borders of the Shirakami-Sanchi, a UNESCO World Heritage Site, and some coastal areas of the town are within the Tsugaru Quasi-National Park. The Akaishi Keiryū Anmon no Taki Prefectural Natural Park is also partly located within the borders of Ajigasawa.