| Acronym | Definition |
|---|
| GC3➣Global Command and Control Center |
| GC3➣Grand Challenge Cosmology Consortium |
| GC3➣Great Conversations 3 (anthology) |
| GC3➣Green Chemistry and Commerce Council (Lowell, MA) |
| GC3➣Government Command, Control, and Communications (System) |
| GC3➣Global Conflict 3 (gaming) |
| GC3➣Ground Control Car Club (formed in 1996) |