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, London, England (National Rail station code)
 * Atatürk Airport, a former major international airport serving Istanbul, Turkey now serves cargo flights

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 League (UK), a Trotskyist party in United Kingdom
 * 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