ISR

ISR is a three-letter abbreviation with multiple meanings, including:

* Country code for ISR a Western Asia country
* Individual Social Responsibility
* Institutional and Scientific Relations Directorate (European Union)
* Intelligence, Surveillance and Reconnaissance in a military context (See ISTAR)
* International Socialist Review U.S Socialist magazine.
* International Star Registry
* International Statistical Review, a journal of the International Statistical Institute
* International Search Report (in patent law)
* Interrupt Service Routine, a software routine that is executed in response to an interrupt
* In-Service Register or Interrupt Service Register. In computer science, a register used to indicate which interrupts are in progress.
* Information, Storage and Retrieval
* Intersecting Storage Rings, a particle collider at CERN
* Initial State Radiation, in particle physics
* Israir
* Information Systems Research, an academic journal in the information systems discipline.
* Incoherent scatter Radar, a ground-based technique for studying the ionosphere.
* In-Stent Restenosis, renewed blockage of a blood vessel after a stent has been implanted.
* Integrated Service Router, a series of Cisco routers.
* International Socialist Resistance
* Inside Sales Representative