JCSI
| Acronym | Definition |
|---|---|
| JCSI | Joint Committee on Statutory Instruments (UK) |
| JCSI | Java Crypto and Security Implementation |
| JCSI | Japan Certification Services, Inc. (Tokyo, Japan) |
| JCSI | Jucikas Computer Services, Inc. (Stow, OH) |
| JCSI | James Charles Sullivan Inc. (staffing firm; Westborough, MA) |