| Acronym | Definition |
|---|
| ISU➣International Skating Union (Switzerland) |
| ISU➣Iowa State University |
| ISU➣Issue |
| ISU➣International Space University |
| ISU➣Ilinois State University |
| ISU➣Idaho State University |
| ISU➣Indiana State University |
| ISU➣Inspectoratul Pentru Situatii de Urgenta (Romanian: Inspectorate for Emergency Situations) |
| ISU➣I-Shou University (Taiwan) |
| ISU➣International School of Uganda |
| ISU➣Independent Study Unit |
| ISU➣Initial Set-Up (software) |
| ISU➣Installshield Uninstall |
| ISU➣Isdn Service Unit |
| ISU➣Invalid Switch Use |
| ISU➣Interlocuteur Social Unique (French: Single Social Contact) |
| ISU➣Incident Support Unit |
| ISU➣Imam Sadiq University (Tehran, Iran) |
| ISU➣International Salvage Union |
| ISU➣Information State Update (dialogue management) |
| ISU➣Isabela State University (Philippines) |
| ISU➣Irkutsk State University (Russia) |
| ISU➣International Stereoscopic Union |
| ISU➣Independent Steelworkers Union |
| ISU➣Instructional Services Unit (various schools) |
| ISU➣Integrated Sensor Unit (avionics) |
| ISU➣Investigative Support Unit |
| ISU➣Integrated Service Umbilical (pipe construction) |
| ISU➣Investigative Services Unit |
| ISU➣Involving Service Users (UK) |
| ISU➣Integrated Sight Unit |
| ISU➣Industry Specific Utilities |
| ISU➣Integrated Service Unit |
| ISU➣Iridium Subscriber Unit |
| ISU➣International Seamen's Union |
| ISU➣Intake Screening Unit |
| ISU➣Infinite Spongy Universe |
| ISU➣Internal Stability Unit |
| ISU➣Indian Student Union |
| ISU➣Internationale Socialisters Ungdom (Danish Political Movement) |
| ISU➣Iowa Southern Utilities |
| ISU➣International Survey Unit (PricewaterhouseCoopers; UK) |
| ISU➣Internal Airlift/Helicopter Slingable-Container Unit |
| ISU➣Instrument Simulator Unit |
| ISU➣Integriertes Steuerungs- und Uberwachungssystem (communications profile) |
| ISU➣Inquiry System Update |
| ISU➣International System Unit |
| ISU➣Internet System Update |
| ISU➣Information Service and Use |