CIS

• 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

• 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.

• 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

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

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

• 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

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

• 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

• 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 (CuInSe₂), used in solar cells and semiconductors
• Corpus Inscriptionum Semiticarum, a corpus of Semitic inscriptions

• Cis (disambiguation)
• ACT-CIS Partylist, a political organization in the Philippines

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