CISU
| Acronym | Definition |
|---|---|
| CISU | Centro Italiano Studi Ufologici (Italian: Italian Center for Unidentified Flying Object Studies) |
| CISU | Central Intelligence and Security Unit (Sierra Leone) |
| CISU | Congregation Israelite Sepharade Unifiee (French: Unified Sephardic Israelite Congregation; Brussels, Belgium) |
| CISU | Clinical Information Science Unit (University of Leeds; UK) |
| CISU | Combat Information Systems Unit |
| CISU | Corporate Information Security Unit |