The Josip Juraj Strossmayer University of Osijek (Croatian: Sveučilište Josipa Jurja Strossmayera u Osijeku, Latin: Universitas studiorum Mursensis), commonly known as the University of Osijek (UNIOS), is a public university based in Osijek, Croatia. Established in 1975, it is the flagship institution of higher education in Slavonia, and one of the largest and oldest universities in Croatia.