CIR or Cir may refer to:

Locations

• Cairo Regional Airport, FAA/IATA code, CIR
• CIR, station code for the Caledonian Road & Barnsbury railway station in the UK
• Christmas Island Resort, a casino/resort in the northeastern Indian Oceans

Organizations

• Center for Individual Rights, a US non-profit public interest law firm
• Center for Investigative Reporting, a nonprofit journalism organization
• Christian Initiative Romero, a German non-profit organization supporting industrial law and human rights in Central America
• Cosmetic Ingredient Review, a consumer safety group

Politics and government

• Commissioner of Internal Revenue, a US Treasury position
• Committee on International Relations, renamed the United States House Committee on Foreign Affairs in 2007
• Comprehensive Immigration Reform Act of 2006, a US Senate bill
• Convention of Republican Institutions, a defunct French political party
• Citizen initiated Referendum, a type of referendum initiated by the signature of a certain minimum number of registered voters
• Cyber and Information Domain Service (Germany) ( German: Cyber- und Informationsraum; CIR), the cyber branch of Germany's military

Science and medicine

• CIR (gene), a gene that encodes the protein corepressor interacting with RBPJ in humans
• Carbon isotope ratio analysis, a subset of isotope ratio mass spectrometry
• Central ischaemic response, a cause of fainting
• Co-rotating interaction region, the interface between fast and slow regions of the solar wind
• Cir, abbreviation for the constellation Circinus

Technology

• Carrier-to-interference ratio, in radio transmission
• Color infrared film, in photography
• Combustion Integrated Rack, an International Space Station microgravity research tool
• Committed information rate, or minimum guaranteed bitrate, in telecommunications
• Consumer IR, a class of remote control and communication devices

Other uses

• Committee on International Relations (University of Chicago), a graduate program
• CIR Group, an Italian holding company
• Coordinator for International Relations, a position within the Japan Exchange and Teaching Program
• Cost/income ratio, a financial ratio
• The Cox–Ingersoll–Ross model for interest rate dynamics
• Campionato Italiano Rally (Italian Rally Championship), in automobile racing
• Arctic Circle Air, ICAO code

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