| Abbreviation | Definition |
|---|---|
| GBSI | Global Biological Standards Institute |
| GCCI | Global Chartered Controller Institute |
| GCG | Governance Commission for Government |
| GCI | Genesee Career Institute |
| GCI | Getty Conservation Institute |
| GCIT | Gloucester County Institute of Technology |
| GCMI | George C Marshall Institute |
| GCMI | Glass Container Manufacturers Institute |
| GCPI | Gulf Coast Pain Institute |
| GCRI | Gujarat Cancer Research Institute |
| GCSI | Global Citizenship Summer Institute |
| GCTI | Govt Central Textile Institute |
| GCVI | Guelph Collegiate Vocational Institute |
| GDCI | Goderich District Collegiate Institute |
| GDFI | Global Digital Freedom Institute |
| GDI | German Development Institute |
| GDI | Green Design Institute |
| GEI | Global Educator Institute |
| GEI | Global Engagement Institute |
| GEI | GREENGUARD Environmental Institute |