Universitas Islam Indonesia adalah sebuah perguruan tinggi swasta yang terdapat di Kota Yogyakarta, Daerah Istimewa Yogyakarta, Indonesia.
Universitas Islam Indonesia or UII is a private university located in Yogyakarta, Indonesia. It was established in 27 Rajab 1364 (Islamic Calendar) or in 8 July 1945 as STI (Sekolah Tinggi Islam - Islamic Higher School) by some leading political figures of the day including Dr. Muhammad Hatta, Mohammad Natsir, Mohammad Roem, Wachid Hasyim as well as Abdul Kahar Mudzakir. STI developed into a university called Universitas Islam Indonesia on 14 December 1947. Historically, UII is the first national university in Indonesia.