| 83329 | Natural gas or steam distribution projects, undertaking contamination studies for | |
| 91132 | Natural gas, administrative services related to | |
| 65212 | Natural gas, coastal water transportation of, in special tankers | |
| 65222 | Natural gas, inland water transportation of, in special tankers | |
| 67990 | Natural gas, liquefaction of, for transportation | |
| 67990 | Natural gas, regasification of, for transportation | |
| 65212 | Natural gas, transoceanic water transportation of, in special tankers | |
| 65122 | Natural gas, transportation of, by railway in special tank cars | |
| 65112 | Natural gas, transportation of, by road in special tank trucks | |
| 65131 | Natural gas, transportation of, via pipeline | |
| 22219 | Natural milk salts, in solid form | |
| 23999 | Natural oleoresins | |
| 88539 | Natural or artificial abrasive products manufacturing services | |
| 81119 | 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 | |
| 67511 | Navigation, coastal or transoceanic, buoys and similar aids to, services of | |
| 67511 | Navigation, coastal or transoceanic, channel markers and similar aids to, services of | |
| 67511 | Navigation, coastal or transoceanic, lighthouses and similar aids to, services of | |
| 67511 | Navigation, coastal or transoceanic, lightships and similar aids to, services of | |
| 67512 | Navigation, inland, buoys and similar aids to, services of | |
| 67512 | Navigation, inland, channel markers and similar aids to, services of | |
| 67512 | Navigation, inland, lighthouses and similar aids to, services of | |
| 67512 | Navigation, inland, lightships and similar aids to, services of | |
| 67990 | Navigational aid locating services, radio | |
| 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 | |