NIIC
| 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) |