| Abbreviation | Definition |
|---|---|
| NIOC | Northern Illinois Offshore Club |
| NIPC | Northern Illinois Parent Club |
| NIPC | Northern Illinois Polo Club |
| NIRC | Northern Ireland Reef Club |
| NIRC | Nottinghamshire Ice Racing Club |
| NIUC | Ninth Isle Ukulele Club |
| NIWC | Nederlandse Ierse Wolfshond Club |
| NJAC | New Jersey Athletic Club |
| NJG | North Jeffco Gem and Mineral Club |
| NJG | North Jeffco Gem Mineral Club |
| NJSC | Northern Japanese Spitz Club |
| NKA | Nanikana-Aerospace |
| NKCC | Nelson Kayak and Canoe Club |
| N-KCHS/gc | Nobleton-King City Horticultural Society/garden club |
| NKWD | Nieformalny Klub Wielce Dyskusyjny (Polish: Informal Discussion Right Club) |
| NLAC | Nittany Lion Aquatic Club |
| NLAC | Northern Lakes Aquatic Club |
| NLBC | Newport Lightning Basketball Club |
| NLC | No Life Club |
| NLFC | Newtons Law of Fitness Club |