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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