| Acronym | Definition |
|---|
| ISR➣Intelligence, Surveillance, and Reconnaissance |
| ISR➣Impuesto Sobre la Renta (Spanish: Income Tax; Mexico) |
| ISR➣Interrupt Service Routine (assembly programming) |
| ISR➣Israel |
| ISR➣Institute for Systems Research (University of Maryland) |
| ISR➣Institute for Social Research |
| ISR➣Institute for Software Research (University of California, Irvine) |
| ISR➣International Socialist Review (US leftist journal) |
| ISR➣Intersphincteric Resection (cancer) |
| ISR➣International Socialist Resistance (youth organization) |
| ISR➣Integrated Stress Response |
| ISR➣Investissement Socialement Responsable (French: Socially Responsible Investment) |
| ISR➣Investigator-Sponsored Research (medical research) |
| ISR➣Infant Swimming Resource (Winter Park, FL) |
| ISR➣Information Systems Research (MIS journal) |
| ISR➣In Situ Recovery (mining process) |
| ISR➣Information, Surveillance and Reconnaissance |
| ISR➣Instituto de Sistemas e Robotica (University of Coimbra; Portugal) |
| ISR➣I Scream Records (est. 1994; Brussels, Belgium) |
| ISR➣In Soviet Russia (gaming) |
| ISR➣Intersecting Storage Rings (CERN) |
| ISR➣Ideal Software Radio |
| ISR➣Interrupt Status Register |
| ISR➣Instruction Sampling Recording |
| ISR➣Integrated Services Router |
| ISR➣Interrupt Service Routine |
| ISR➣Intermediate Session Routing |
| ISR➣In Stent Restenosis |
| ISR➣Inverter Spike Resistant (magnet wire insulation) |
| ISR➣Inside Sales Representative (HP) |
| ISR➣Incoherent Scatter Radar |
| ISR➣Immediate Serial Recall (memory) |
| ISR➣Induced Systemic Resistance (plant biology) |
| ISR➣Instrument Science Report |
| ISR➣International Star Registry (est. 1979; Illinois) |
| ISR➣International Society of Radiology |
| ISR➣Industrial Security Regulation (US DoD 5220.22-R) |
| ISR➣Industry Sponsored Research (various organizations) |
| ISR➣Information Science Reference (publishing imprint) |
| ISR➣Intermediate Session Routing (IBM) |
| ISR➣Installation Status Report |
| ISR➣International Simple Resale |
| ISR➣Income Sensitive Repayment (Federal Family Education Loan Program) |
| ISR➣Information Services and Resources |
| ISR➣International Survey Research |
| ISR➣Institute of Surgical Research (University of Munich, Germany) |
| ISR➣International Statistical Review |
| ISR➣International Shipping Register (various locations) |
| ISR➣Industrial Special Risks |
| ISR➣Information Service Representative (various companies) |
| ISR➣Individual School Range (head teacher salary scale; UK) |
| ISR➣Interactive Student Response |
| ISR➣Independent Shifting Rod (Lamborghini transmission) |
| ISR➣Insurance Service Representative (various locations) |
| ISR➣Incurred Sample Reanalysis |
| ISR➣International Student Registration (Long Beach United School District; Long Beach, CA) |
| ISR➣Internet Suspend Resume |
| ISR➣Injection Site Reaction |
| ISR➣Irish Society for Rheumatology (Ireland) |
| ISR➣Information Systems Resources |
| ISR➣Indie Spinner Rack (talk show) |
| ISR➣Institute for Scientific Research, Inc |
| ISR➣Institute for Surgical Research (Brooke Army Medical Center, TX, Medical Research Materiel Command, US Army) |
| ISR➣Interrupt Service Register |
| ISR➣Integrated Switching Regulator (Electronics) |
| ISR➣Initial Service Release |
| ISR➣Internal Service Request |
| ISR➣Individualised Student Record (UK) |
| ISR➣Information Storage & Retrieval |
| ISR➣Indirect Source Review |
| ISR➣Intra Squad Radio |
| ISR➣Immediate System Recovery (Raxco) |
| ISR➣Implementation Status Report |
| ISR➣Integrated Switch Router |
| ISR➣In-Service Repair |
| ISR➣Inland Slope Rebels (Riverside, CA) |
| ISR➣Institute for Safety Research and Reactor Technology |
| ISR➣Institute of Snow Research |
| ISR➣Irish Sports Report (Notre Dame; Indiana) |
| ISR➣In Service Review |
| ISR➣Infrared Scanning Radiometer |
| ISR➣In School Restriction (punishment) |
| ISR➣Independent Science Review |
| ISR➣In-Service Recruiter |
| ISR➣Integrated SONET Router (Cisco) |
| ISR➣Independent Safety Review |
| ISR➣Identification Safety Range |
| ISR➣Interference Subspace Rejection |
| ISR➣Immunostimulator |
| ISR➣Intermediate Stress Relief |
| ISR➣Interim Systems Review |
| ISR➣Inventory/Sales Ratio |
| ISR➣Independent Sufficiency Review |
| ISR➣Interviewer Severity Rating |
| ISR➣Institute of Species Research (India) |
| ISR➣Intelligence, Sensors, Reconnaissance |
| ISR➣Immediate Spray Reroute |
| ISR➣Information Services Request |
| ISR➣Input Storage Receiver |
| ISR➣Inspection/Surveillance Report |
| ISR➣Individual Soldier Radio |
| ISR➣Initial Services Requirements (Sprint) |
| ISR➣Initial Source Requisition |
| ISR➣Instructional System Review |
| ISR➣Investment Strategy Review |
| ISR➣Integrated Switch Router Technical Specification |
| ISR➣Integrated Service Request (Sprint PCS) |
| ISR➣Institutional Supporting Research |
| ISR➣Information Source Repository |
| ISR➣Internal State Reversion |
| ISR➣Ingénieur Sûreté Radioprotection (French: Radiation Safety Engineer) |