| 64410 | Natural gas, transportation of, via pipeline | |
| 23999 | Natural oleoresins | |
| 81190 | Natural sciences, other, research and experimental development concerning | |
| 91114 | Natural sciences, the, administrative services related to research into | |
| 33610 | Natural uranium and its compounds, and alloys, dispersions and mixtures thereof | |
| 96422 | Nature reserve services including wildlife preservation services | |
| 96422 | Nature reserves, conservation of | |
| 96422 | Nature reserves, maintenance of | |
| 96422 | Nature reserves, services of | |
| 96422 | Nature reserves, supervision of | |
| 87154 | Navigation instruments, maintenance and repair of | |
| 67300 | Navigation, buoys and similar aids to, services of | |
| 67300 | Navigation, channel markers and similar aids to, services of | |
| 67300 | Navigation, lighthouses and similar aids to, services of | |
| 67300 | Navigation, lightships and similar aids to, services of | |
| 67300 | Navigational aid locating services, radio | |
| 67300 | Navigational aid services | |
| 48220 | Navigational apparatus, radio or radar (incl. that for blind approach landings and airport traffic control) | |
| 48211 | Navigational instruments and apparatus | |
| 48160 | Nebulizers | |
| 28229 | Neckerchiefs, knitted or crocheted of textile materials | |
| 28238 | Neckerchiefs, with no side exceeding 60 cm in length, knitted or crocheted | |
| 38997 | Necklaces, of base metal, whether or not plated with precious metal | |
| 38999 | Necklaces, of coral (natural or agglomerated) | |
| 38997 | Necklaces, of glass smallwares incorporating no other material except for assembly | |
| 38999 | Necklaces, of ivory | |
| 38240 | Necklaces, of precious metal, whether or not gem-set | |
| 38240 | Necklaces, of precious or semiprecious stones (natural, synthetic or reconstructed), containing precious metal only as minor constituents | |
| 38999 | Necklaces, of tortoiseshell | |
| 38997 | Necklaces, of two or more non-precious non-metals | |
| 38240 | Necklaces, pearl (natural or cultured), containing precious metal only as minor constituents (e.g., gold fastener) | |
| 38360 | Necks for string musical instruments | |
| 28229 | Neckties, knitted or crocheted of textile materials | |
| 28242 | Neckties, of leather or composition leather | |
| 28238 | Neckties, textile, not knitted or crocheted | |
| 01349 | Nectarines, fresh or chilled | |
| 44640 | Needle bars for hosiery machines | |
| 44640 | Needle boards for textile machines | |
| 44640 | Needle cams for knitting-machines | |
| 44640 | Needle cylinders for circular knitting-machines | |