CIS may refer to:

Computing

* Card information structure, formatting and organization data stored on a PC card * Center for Internet Security, cybersecurity benchmarks, controls, practices and tools * Center for Internet and Society (disambiguation) * Comodo Internet Security suite * CompuServe Information Service, a US commercial online service * Computer information systems, technologies which process data to solve business problems * Configuration interaction singles, a quantum-chemical method for computing electronic states * Contact image sensor, a technology developed for optical flatbed scanners * Continuous ink system, for ink-jet printers

Education

* Calcutta International School, in India * Canadian International School (disambiguation) ** Canadian International School (Bangalore) ** Canadian International School Vietnam ** Canadian International School of Sanya, in China ** Canadian International School (Singapore) ** Canadian International School (Tokyo) * Cayman International School in Grand Cayman, Cayman Islands * Cebu International School, in the Philippines * Chinese International School, in Hong Kong * Clifford International School, in Guangzhou, Guangdong, China * College in the Schools, a program for high school students run by the University of Minnesota, U.S. * Colombo International School, in Sri Lanka * Communities In Schools, a U.S. federation of organizations combating educational dropout * Copenhagen International School, in Denmark * Council of International Schools, an international educational community organizations * MIT Center for International Studies, in Massachusetts, U.S.

Health

* Cancer Information Service, a program of the US National Institutes of Health * Carcinoma in situ, group of abnormal cells which may be cancer * Clinically isolated syndrome, an initial neurological episode related to nerve tissue * Combined intracavernous injection and stimulation test, a diagnostic procedure for erectile dysfunction

Organizations

United States

* Center for Immigration Studies, an American anti-immigration think tank * United States Citizenship and Immigration Services, a US government agency

British

* Christians in Science, a UK organization * Co-operative Insurance Society, a British insurance company

Canadian

* Canadian Ice Service, a division of the Meteorological Service of Canada * Canadian Identification Society, of police and civilians in crime scene investigation * Canadian Interuniversity Sport, a former name of the national governing body of university sport

Eurasian

* Commonwealth of Independent States, a Eurasian intergovernmental organization ** CIS national football team, a National association football team

Other

* Centre for Independent Studies, an Australian libertarian think tank * Centro de Investigaciones Sociológicas, a Spanish public research institute * CIS Corps (Ireland), Communications and Information Services Corps, Irish combat support corps * Cisalpino, Swiss–Italian railway company (CIS in timetables) * Commonwealth Police (Commonwealth Investigation Service), an Australian security service, 1945 to 1960

Other uses

* Canton Island Airport, Kanton Island, Phoenix Islands, Kiribati, IATA code * Capital Indoor Stadium, an indoor arena in Beijing, China * Case Information Statement, a document used in US civil lawsuits * cis (mathematics), a trigonometric mathematical function * CIS Tower, a building in Manchester, England * Common Intelligibility Scale, for speech intelligibility * Community Innovation Survey, a series of surveys throughout the European Union * Confederacy of Independent Systems, a fictional entity in the ''Star Wars'' universe * Bosch K-Jetronic, Continuous Injection System, a fuel injection system developed by the Robert Bosch Group * Copper indium selenide (CuInSe₂), used in solar cells and semiconductors * Corpus Inscriptionum Semiticarum, a corpus of Semitic inscriptions