ius

Ius or IUS may refer to:

• Ius, the Latin word for "law" or "right"
• Ius (Canon Law), a rule within the Roman Catholic Church
• Intrauterine system, a long-acting reversible hormonal contraceptive device
• Interactive Unix, a port of the UNIX System V operating system for Intel x86 processors
• Inertial Upper Stage, a two-stage solid-fueled booster rocket developed by the U.S. Air Force
• Indiana University Southeast, a regional campus in the Indiana University system located in New Albany, Indiana
• International Union of Students, a worldwide nonpartisan association of university student organizations
• International University of Sarajevo, a private university located in Sarajevo, Bosnia and Herzegovina
• Inter-University Seminar on Armed Forces and Society, a professional organization for research on military institutions, civil-military relations, and military sociology
• Innovation Union Scoreboard; formerly known as the (EIS) is an EU measure of and comparative assessment of the innovation performance of EU Member States.

Ius or Jus (Latin, plural iura) in ancient Rome was a right to which a citizen (civis) was entitled by virtue of his citizenship (civitas). The iura were specified by laws, so ius sometimes meant law. As one went to the law courts to sue for one's rights, ius also meant justice and the place where justice was sought.