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