| Acronym | Definition |
|---|
| GISI➣Graphic Imaging Services, Inc. (Las Vegas, NV) |
| GISI➣Gruppo Imprese Strumentazione Italia (Italian: Enterprise Instrumentation Group Italy) |
| GISI➣Gereja Injil Seutuh Indonesia (Indonesian gospel church) |
| GISI➣Group Insurance Solutions, Inc. |
| GISI➣Gruppo Italiano Studio Ipovisione (Italian: Italian Low Vision Study Group) |
| GISI➣Global Invasive Species Initiative |