| Acronym | Definition |
|---|
| NISG➣National Institute for Smart Government (India) |
| NISG➣Northern Ireland Safety Group (est. 1952; UK) |
| NISG➣Northern Iowa Student Government |
| NISG➣Networking and Internet Software Group (Pune University; India) |
| NISG➣Naval Installation Survey Group |
| NISG➣Navy IPv6 Steering Group |