| Acronym | Definition |
|---|
| NIIC➣Northeast Indiana Innovation Center (Fort Wayne, IN) |
| NIIC➣Northern Illinois-Iowa Conference (intercollegiate athletic conference) |
| NIIC➣National Incident Information Center |
| NIIC➣North Icelandic Irminger Current |
| NIIC➣Nikolaev Institute of Inorganic Chemistry (Novosibirsk, Russia) |
| NIIC➣Northern Ireland Institute of Coaching (est. 1980; UK) |