ISF may stand for:

Science and technology

Interstitial fluid In cell biology, extracellular fluid (ECF) denotes all body fluid outside the cells of any multicellular organism. Total body water in healthy adults is about 60% (range 45 to 75%) of total body weight; women and the obese typically have a lower ...

* Imaging Science Foundation * Incremental sheet forming *

Information Security Forum The Information Security Forum (ISF) is an independent information security body. Primary deliverables The ISF delivers a range of content, activities, and tools. The ISF is a paid membership organisation: all its products and services are inc ...

, an international information security best practices organization * Ingenieurs Sans Frontieres (Engineers Without Borders) * Ink Serialized Format, a vector image file format from Microsoft *

Israel Science Foundation The Israel Science Foundation (ISF) is a nonprofit organization that provides monetary grants for scientific research in Israel. It is the Israeli analogue of scientific funding bodies in other countries such as the US National Science Foundation o ...

Education

* Idries Shah Foundation, educational charity *

Independent Schools Foundation Academy The Independent Schools Foundation Academy is a non-profit bilingual (Mandarin and English) private independent school in Hong Kong. It is also an IBO World School, and offers the IB Middle Years Programme and Diploma Programme. The campus is ...

, private international school in Hong Kong * Insaf Student Federation, it is the largest Center-Left Student organization in the Nation and the official student wing of the Pakistan Tehreek-e-Insaf political party *

International School of Florence The International School of Florence (ISF) is one of the oldest international schools in Europe. It is located in Florence, Italy, and was formerly called the American International School of Florence. The ISF is an independent, coeducational, and ...

* International School Sport Federation, sports governing body for high school sport *

Internationale Schule Frankfurt Rhein-Main The ISF International School Frankfurt Rhein-Main is a private school in Sindlingen, a borough of Frankfurt am Main, Germany. Accredited by the Council of International Schools, the school offers IGCSE, International Baccalaureate and AP examin ...

Sport

* International Snowboard Federation * International Softball Federation *

International Skyrunning Federation The International Skyrunning Federation (ISF) is the world governing body for skyrunning. The ISF today counts 41 Member nations. The Federation of Sports at Altitude (FSA) used to be the organization which governed and managed the sports of skyrun ...

, world sports governing body for skyrunning *

International Socca Federation The International Socca Federation (ISF) is an organization which sets up the Socca World Cup. It sets up as a governing body for six-a-side football specifically. History Formation The ISF was formed in late 2017 by leading providers of sma ...

, governing body of small-sided-football *

International Sumo Federation The International Sumo Federation (IFS) is the largest international governing body of sport Sumo with over 87 member countries. It was formed in 1992 and is the only Sumo organization recognised by the International Olympic Committee and World An ...

, governing body for

amateur sumo is a form of competitive full-contact wrestling where a ''rikishi'' (wrestler) attempts to force his opponent out of a circular ring (''dohyō'') or into touching the ground with any body part other than the soles of his feet (usually by thr ...

Other

Importer Security Filing The Importer Security Filing (ISF) also referred to as 10+2, is a customs import requirement of the U.S. Customs and Border Protection, United States Customs and Border Protection (CBP) ; which requires containerized cargo information, for securit ...

* Impôt de Solidarité sur la Fortune, a French wealth tax *

International Seafarers' Federation The International Seafarers' Federation (ISF) was a global union federation bringing together trade unions representing sailors. Until the end of World War I, sailors were represented by the International Transport Workers' Federation (ITF), but un ...

, former international trade secretariat *

Idaho Shakespeare Festival The Idaho Shakespeare Festival is a regional Repertory, repertory theatre located in Boise, Idaho, United States. Its performances are presented in the summer months, June to September. It has an arrangement to share its repertory cast with the ...

, theater company * Île Sans Fil, a community wireless network based in Montreal, Canada *

Internal Security Forces The Internal Security Forces Directorate ( ar, المديرية العامة لقوى الأمن الداخلي, al-Mudiriyya al-'aamma li-Qiwa al-Amn al-Dakhili; french: Forces de Sécurité Intérieure; abbreviated ISF) is the national polic ...

, of Lebanon *

Iraqi security forces The Iraqi Security Forces (ISF) is a term used by the United States Department of Defense (DoD) to describe law enforcement and military forces of the federal government of the Republic of Iraq. During the Iraq War, these entities received trainin ...

Lexus IS F The Lexus IS (XE20) is the second generation of the Lexus IS line of compact executive cars. Sold by Lexus since 2005, the line includes multiple V6 gasoline-powered models, in four-door sedan and two-door coupé convertible body styles. Addi ...

* Italian Strategic Fund {{disambiguation