ISU may refer to:

Schools

United States

  • Idaho State University, Pocatello, Idaho
  • Illinois State University, Normal, Illinois
  • Illinois State University (Springfield, Illinois)
  • Indiana State University, Terre Haute, Indiana
  • Iowa State University, Ames, Iowa

Elsewhere

  • I-Shou University, Kaohsiung, Taiwan
  • Ifugao State University, in the Philippines
  • Ilia State University, in Tbilisi, Georgia
  • Imo State University
  • Ingush State University, in Magas, Republic of Ingushetia
  • International School of Uganda, Kampala, Uganda
  • International School of Ulaanbaatar, Mongolia
  • International Solomon University, in Ukraine
  • International Space University, Illkirch-Graffenstaden, France
  • Irkutsk State University, in Eastern Siberia

Organizations

  • ISU (trade union), British trade union formerly known as the Immigration Service Union
  • Integrated Security Unit, in Canada
  • Internal Security Unit, the counter-intelligence unit of the Provisional Irish Republican Army (IRA)
  • International Seamen's Union
  • International Skating Union

Other

  • Italian Service Units, Italian prisoner of war army units that served on the Allied side during World War II
  • ISU (singer)
  • Isu language (Bantu), also called Suwu or Subu, a Bantu language of Cameroon
  • Isu language, a Grassfields Bantu language of Cameroon
  • Isu, Nigeria, a local government area of Imo State
  • Isu people, an ethnic group in Nigeria
  • Isu station, on the Seoul Metropolitan Subway
  • ISU-152, ISU-122, Soviet self-propelled guns
  • SAP IS-U, Industry Specific Solution for Utilities
  • International System of Units, the SI system
  • ISU, the IATA airport code for Sulaimaniyah International Airport, Iraq