ISL

Isl (or isl) is a common abbreviation for "island" or "islands".

ISL may also refer to:

• Iceland, a Nordic European island country
• In-situ leach, a mining technique
• Independent Socialist League, a defunct Trotskyist group in the United States (originally called the "Workers Party")
• 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
• International Socialist Left (Germany) (German: internationale sozialistische linke), a Trotskyist group in Germany
• Irish Shipping Limited, an Irish state-owned deepsea shipping company formed during World War II
• Lyapunov stability in mathematics, from the phrase "[i]n the [s]ense of [L]yapunov"
• Island Line (MTR), one of the rapid transit railway lines in Hong Kong

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
• Indian Sign Language or Indo-Pakistani Sign Language (IPSL) also known as sign language of the deaf community in India
• International Sign Language, an international auxiliary language
• Irish Sign Language, the sign language of Ireland
• Israeli Sign Language, the most commonly used sign language within Israel's deaf community

Sports

• 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
• Indian Super League, a professional football-club league based in India.
• 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