| 16190 | Nickel sulphide, natural | |
| 88731 | Nickel, metallic coating in by chemical treatment | |
| 88731 | Nickel, metallic coating in by electrolysis | |
| 41422 | Nickel-chromium alloys (nickel predominating), unwrought | |
| 41422 | Nickel-chromium-iron alloys (nickel predominating), unwrought | |
| 41422 | Nickel-copper alloys (nickel predominating), unwrought | |
| 34220 | Nickelic oxide | |
| 14220 | Nickelin | |
| 41422 | Nickel-iron alloys (nickel predominating), unwrought | |
| 41422 | Nickel-magnesium alloys (nickel predominating), unwrought | |
| 41604 | Nickel-magnesium oxide cermets | |
| 34220 | Nickelous hydroxide | |
| 34220 | Nickelous oxide | |
| 35250 | Nicocodine (INN), not put up as medicaments | |
| 35250 | Nicodicodine (INN), not put up as medicaments | |
| 35250 | Nicomorphine (INN), not put up as medicaments | |
| 35250 | Nicotinamide (INN), not put up as medicaments | |
| 35250 | Nicotinamide hydrochloride, not put up as medicaments | |
| 35260 | Nicotinamide hydrochloride, put up as medicaments in measured doses or in forms or packings for retail sale | |
| 34160 | Nicotinamide-adenine dinucleotide | |
| 35250 | Nicotine hydrochloride, not put up as medicaments | |
| 34662 | Nicotine put up as a fungicide in forms or packings for retail sale | |
| 34661 | Nicotine put up as an insecticide in forms or packings for retail sale | |
| 35250 | Nicotine salicylate, not put up as medicaments | |
| 35250 | Nicotine salts, not put up as medicaments | |
| 35250 | Nicotine sulphate, not put up as medicaments | |
| 35250 | Nicotine, not put up as medicaments or insecticides | |
| 35250 | Nicotinic acid (INN), not put up as medicaments | |
| 35250 | Nicotinic acid amide, not put up as medicaments | |
| 35260 | Nicotinic acid amide, put up as medicaments in measured doses or in forms or packings for retail sale | |
| 35250 | Nicotinic ester of vitamin B1 | |
| 35250 | Nicotinomorpholide, not put up as medicaments | |
| 35260 | Nicotinomorpholide, put up as medicaments in measured doses or in forms or packings for retail sale | |
| 35250 | Nicotinoylcodeine, not put up as medicaments | |
| 53129 | Night clubs | |
| 53129 | Nightclubs | |
| 54129 | Nightclubs, general construction of | |
| 88221 | Nightdress manufacturing services | |
| 28227 | Nightdresses, babies', knitted or crocheted | |
| 28235 | Nightdresses, babies', not knitted or crocheted | |