| Acronym | Definition |
|---|
| CISN | California Integrated Seismic Network |
| CISN | Collaborative Internet Security Network (CyberDefender Corp.) |
| CISN | Community Integrated Service Network (health care provider system) |
| CISN | Communications, Information Systems and Networks |
| CISN | Comité Interministériel de la Sécurité Nucléaire (French: Interministerial Committee on Nuclear Safety) |
| CISN | Computer Information Systems Networking (computing class) |
| CISN | Computer Info Science-Network (computing class) |
| CISN | Carrier Interactions and Spintronics in Nanostructures |
| CISN | Computing and Information Services Newsletter |
| CISN | Caribbean Information Sharing Network |
| CISN | Cable Integrated Services Network |
| CISN | Cal Independent Scholars Network (California) |
| CISN | Communications Information, Systems, & Network(s) |
| CISN | Communities in Schools of Newark, Inc. (New Jersey) |