# ISL

Isl (or isl) is a common abbreviation for "island" or "islands".
ISL may also refer to:

## Education and research

* Illinois Security Lab, a research laboratory at the University of Illinois at Urbana-Champaign
* Independent School League (disambiguation), independent high school athletic conferences in the United States
* Institute of State and Law, a Russian legal think tank affiliated with the Russian Academy of Sciences
* International School of Louisiana, a charter school system in the United States
* International School of Lusaka, an international school in Zambia
* International School of Luxembourg, a privately owned non-profit school in Luxembourg
* International School of Lyon, an international school in France

## Languages

* Icelandic language (ISO 639-2 tag: ISL), a language spoken in Iceland
* Icelandic Sign Language, the sign language of Iceland
* Indian Sign Language also known as sign language of the deaf community in India
* International Sign Language, any of several international auxiliary languages
* Irish Sign Language, the sign language of Ireland
* Israeli Sign Language, the most commonly used sign language within Israel's deaf community
* Italian Sign Language, sign language used for Italian deaf people

## Sports

* Independent School League (Illinois), a group of nine Chicago-area preparatory schools
* Independent School League (New England), a group of 16 New England preparatory schools
* Independent School League (Washington, D.C. area), a group of 17 Washington, D.C. preparatory schools
* Interscholastic League of Honolulu, a group of Hawaiian private schools
* Indian Super League, a professional football-club league based in India
* Ice Hockey Superleague, a British-based ice hockey league that existed between 1996 and 2003
* Indonesia Super League, the top-tier competition for football clubs in Indonesia
* International Soccer League, a U.S. based soccer league which was formed in 1960 and collapsed in 1965
* International Sport and Leisure, a bankrupt Swiss sports marketing company that was closely affiliated with FIFA and the IOC
* Iranian Super League (disambiguation), the Iranian professional basketball, futsal or volleyball leagues
* Island Soccer League, a professional six-a-side association football league based in Bermuda
* International Swimming League, a professional swimming league with ten teams and nine rounds in different cities all over the world

## Transport

* Island line (MTR), one of the rapid transit railway lines in Hong Kong
* Isleworth railway station (National Rail station code ISL), Hounslow, London, England, UK
* Atatürk Airport (IATA airport code ISL), a former major international airport serving Istanbul, Turkey now serves cargo flights
* Iowa and St. Louis Railway (I&SL), USA

## Political organizations

* Independent Socialist League, a defunct Trotskyist group in the United States (originally called the "Workers Party")
* International Socialist League (South Africa), a former syndicalist group
* International Socialist Left (Germany) (German: internationale sozialistische linke), a Trotskyist group in Germany

## Other uses

* Iceland, a Nordic European island country
* In situ leach, a mining technique
* Independent state legislature theory, U.S. Constitution reading
* Integer set library (isl), a programming library for manipulating integer sets
* Inter-Switch Link (disambiguation), a specially configured connection between network equipment
** Cisco Inter-Switch Link, a proprietary Cisco VLAN trunking protocol
* Intercon Security, a security firm
* Irish Shipping Limited, an Irish state-owned deepsea shipping company formed during World War II
* i. s. L., "in the sense of Lyapunov" (in mathematical contexts), a reference to Lyapunov stability
* International Service Learning, a humanitarian NGO that offers volunteers practical experience in medical, education, and community enrichment programs