CIRN
| Acronym | Definition |
|---|---|
| CIRN | Community Informatics Research Network (est. 2003) |
| CIRN | Club Italiano Razze Nordiche (Italian: Italian Club of Northern Breeds; est. 1976; Milan, Italy) |
| CIRN | Clinical Information Resource Network |
| CIRN | Carpathia Intelligent Routing Network (Carpathia Hosting, Inc.; Virginia) |
| CIRN | Commanders Information Reporting Network |
| CIRN | Center of Industrial Relations and Negotiations (est. 2003; Greece) |