| CIRN | Cambridge Italian Research Network 
| Others |
| CIRN | Canadian Immunization Registry
| Others |
| CIRN | Canadian Immunization Registry Network
| Others |
| CIRN | Canadian Immunization Research Network
| Others |
| CIRN | Center for Industrial Relations and Negotiations
| Others |
| CIRN | Central Idaho Rangelands Network
| Others |
| CIRN | Centre for Interdisciplinary Research on Narrative
| Others |
| CIRN | Clinicians in Research Network
| Others |
| CIRN | Club Italiano Razze Nordiche
| Others |
| CIRN | Colegio de Ingenieros en Recursos Naturales
| Others |
| CIRN | Commanders Information Report Network
| Others |
| CIRN | Countywide Interoperable Radio Network
| Others |
| CIRN | Criminal Investigation Research Network
| Others |
| CIRN | Culture and Identity Research Network
| Others |
| CIRN | Curtin Indigenous Research Network
| Others |