| JSI | J Smith innovations
| Others |
| JSI | Jackknife Slope Index
| Others |
| JSI | Janitorial Services Inc
| Others |
| JSI | Jantzi Social Index
| Others |
| JSI | Japan Securities Incorporated
| Others |
| JSI | Japan Studies Institute
| Others |
| JSI | Java Service Interaction
| Others |
| JSI | Java Spatial Index
| Others |
| JSI | Jaws Script Initialization
| Others |
| JSI | JJH Scene Investigation
| Others |
| JSI | Job Search India
| Others |
| JSI | Job Squad Inc
| Others |
| JSI | Job Strain Index
| Others |
| JSI | Joe Solberg Inc
| Others |
| JSI | John Snow Inc
| Others |
| JSI | John Staurulakis Inc
| Others |
| JSI | Joint Service Interface
| Others |
| JSI | Journal of School Improvement
| Others |
| JSI | Journal of Social Issues
| Others |
| JSI | Journal of Spectral Imaging
| Others |
| JSI | Journal of Stomatological Investigation
| Others |
| JSI | Julian Street Inn
| Others |
| JSI | Junior Scholars Institute
| Others |
| JSI | Junior Summer Institute
| Others |
| JSI | Justice and Security Institute
| Others |
| JSI | Skiathos, Greece
| Others |