Isa

**Isa** or **ISA** may refer to:

## Places
* Isa, Amur Oblast, Russia
* Isa, Kagoshima, Japan
* Isa, Nigeria
* Isa District, Kagoshima, former district in Japan
* Isa Town, middle class town located in Bahrain
* Mount Isa, Queensland, Australia
* Isa (river), a river in Belarus

## People
* Isa (name), an Arabic name corresponding to Jesus in English
* Īsā, the name of Jesus in Islam
* Isa Tengblad (born 1998), Swedish singer using the mononym Isa
*Isa, real name is Lee Chae-young, singer, member of STAYC

## Arts, entertainment, and media
### Fictional entities
* ISA (*Days of Our Lives*), spy agency in TV series
* Isa the iguana, in TV series *Dora the Explorer*
*Interplanetary Strategic Alliance (ISA), military alliance in videogame saga *Killzone*

### Other uses in arts, entertainment, and media
* *Isa* (album), a 2004 album by Enslaved
* Isa (comics), of graphic novel series *Les Passagers du vent*
* *Isa* (movie), a 2014 television movie
* Isa, a dance in music of the Canary Islands

## Computing
* Industry Standard Architecture, a PC computer bus standard
* Instruction set architecture, the specification for data types, registers, instructions, etc. for a given computer hardware architecture
* Is-a, a relationship between abstractions in programming
* Internet Security and Acceleration, a network router, firewall, antivirus program, VPN server and web cache from Microsoft Corporation

## Education
* Indian Squash Academy, Chennai, India
* Independent Schools Association (Australia), mainly for sports
* Independent Schools Association (UK)
* Iniciativa de Salud de las Americas, Spanish name for Health Initiative of the Americas
* Institute for the Study of the Americas, University of London, England
* Instituto Superior de Agronomia, an agronomy faculty in Lisbon, Portugal
* Instituto Superior de Arte, an art school in Havana, Cuba
* International School Amsterdam, the Netherlands
* International School Augsburg
* International School of Aleppo, Syria
* International School of Athens, Greece
* International School of the Americas, San Antonio, Texas
* International Studies Association
* Islamic Saudi Academy

## Finance
* Income share agreement, US, a borrowing agreement sometimes used for tuition loans
* Individual savings account, UK
* International Standards on Auditing
* Israel Securities Authority

## Government
* Independent Safeguarding Authority, former UK child protection agency
* Intelligence Services Act 1994, UK
* Intelligence Support Activity, of the US Army
* Internal Security Agency, secret service and counter-espionage agency in Poland
* International Seabed Authority, for mineral-related activities
* International Searching Authority, for patents
* International Solar Alliance
* Interoperability Solutions for European Public Administrations, EU
* Invention Secrecy Act
* Iranian Space Agency
* Israel Security Agency or Shin Bet, Israel
* Israel Space Agency
* Israel State Archives, the national archive of Israel
* Italian Space Agency

## Organizations and brands
* Industry Super Australia, the peak body for Industry superannuation funds in Australia
* Information Systems Associates FZE, an aviation software house
* Innovative Software Applications, a company taken over by Sorcim in 1982
* International Seabed Authority
* International Socialist Alternative, an international association of Trotskyist political parties.
* International Society of Arboriculture, a non-profit botanical organization
* International Society of Automation, a non-profit professional organization for engineers, technicians, and students
* International Sociological Association
* International Soling Association
* International Surfing Association, the world governing authority for the sport of surfing
* Irish Sailing Association, the governing body for sailing in Ireland
* International Slackline Association

## Science
* Isosaccharinic acid, a six-carbon sugar acid
* Intrinsic sympatheticomimetic activity, a term used with beta blockers that are partial agonists
* Infectious salmon anemia, a viral disease of salmon
* International Standard Atmosphere, an atmospheric model of the Earth

## Other uses
* Intelligent speed adaptation, systems to automatically enforce vehicle speed limits
* International Symbol of Access, blue and white wheelchair symbol
* ISA Brown, type of chicken
* Ideological state apparatus, a theory by Louis Althusser