Complete BIC Category Listing
| Narrowboats & Canals | WGGN | x3 |
| National & Regional Cuisine | VBN | x42 |
| Nationalism | JPFN | x25 |
| Natural History & Pets | YWN | x6 |
| Natural History, Country Life & Pets | WN | x33 |
| Natural History: Butterflies | WNCN1 | x1 |
| Natural History: Insects & Spiders | WNCN | x2 |
| Natural Language & Machine Translation | UXCN | x0 |
| Nature & Existence Of God | HRAB1 | x4 |
| Nature In Art, Still Life, Landscapes & Seascapes | AFZS3 | x4 |
| Naval Forces & Warfare | JWF | x31 |
| Naval Forces & Warfare | YJWF | x0 |
| Navigation | TRLN | x4 |
| Needlework & Fabric Crafts | VHB | x3 |
| Neonatal Medicine | MJWN | x0 |
| Netherlands | 1DDN | x1 |
| Network Security | UTN | x3 |
| Neurology & Clinical Neurophysiology | MJN | x7 |
| Neurosciences (non-Medical) | PSAN | x0 |
| Neurosurgery | MNN | x0 |
