CIRA can refer to:
- CIRA, COSPAR international reference atmosphere, an empirical model of the upper atmosphere
- CIRA, IRS - Common Interest Real estate Association - The IRS name for home owners associations, condominium associations, property owner associations, time-share associations.
- Ćira, popular Serb singer
- Canadian Internet Registration Authority
- Centre International de Recherches sur l'Anarchisme (CIRA) in Lausanne, Switzerland
- Centro Italiano Ricerche Aerospaziali, the Italian Aerospace Research Centre.
- CIRA-FM
- Central Illinois Regional Airport
- Comprehensive Immigration Reform Act, Senate Proposed Legislation, S. 2611
- Continuity Irish Republican Army
- Cooperative Institute for Research in the Atmosphere
- Yale University Center for Interdisciplinary Research on AIDS (CIRA)
- Cellular Internet Routing Appliance CIRA, a network device from Feeney Wireless
- Client Initiated Remote Access, a remote access technology from Intel
- Certified Insolvency and Restructuring Advisor, a qualification issued by the Association of Insolvency and Restructuring Advisors