CISI
| Acronym | Definition |
|---|---|
| CISI | Chartered Institute for Securities & Investment (professional body; UK) |
| CISI | Comité Interministériel pour la Société de l'Information |
| CISI | CIBC (Canadian Imperial Bank of Commerce) Investor Services, Inc. |
| CISI | Chapter, Item, Sub-Item |
| CISI | Customer & Integrated Services Institute |
| CISI | Church of Individual Spiritual Identity |
| CISI | Communications Information Services, Incorporated |