# CIS

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 and information science, a field that emphasizes both computing and informatics
* 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
* Continuous Injection System, a fuel injection system developed by the Robert Bosch Group
* Copper indium selenide (CuInSe$_2$), used in solar cells and semiconductors
* Corpus Inscriptionum Semiticarum, a corpus of Semitic inscriptions