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 American 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 International Commonwealth of Independent States, a geopolitical region comprising a number of former Soviet Republics CIS national football team, football team representing the Commonwealth of Independent States 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