CIIS
| Acronym | Definition |
|---|---|
| CIIS | California Institute of Integral Studies |
| CIIS | China Institute of International Studies (Beijing, China) |
| CIIS | Comitato Interministeriale per le Informazioni e la Sicurezza (Italian: Interministerial Committee for Information and Security) |
| CIIS | Center for Integrated Intelligence Systems |
| CIIS | Controlled Items Inventory System |
| CIIS | Client Integration Implementation Service |
| CIIS | Compatibility, Interoperability, Integration and C4 Supportability |