Ius or IUS may refer to:
Education Indiana University Southeast, an American campus International Union of Students, a global association of student unions International University of Sarajevo, Bosnia and Herzegovina Inter-University Seminar on Armed Forces and Society, for military sociology research
Law and government Ius, a right afforded to ancient Romans Ius (canon law), a Roman Catholic custom Innovation Union Scoreboard, an EU comparator of innovation by member states
Science and technology Inertial Upper Stage, a two-stage booster rocket Interactive Unix, an operating system port Intrauterine system, a contraceptive device
See also IU (disambiguation) Jus (disambiguation)