CIR

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