| nitre | niter |
| nitreux | nitrous |
| nitrification | nitrification |
| nitroglycérine | nitroglycerin |
| Nitrogène | Nitrogen |
| Nitroimidazole | Nitroimidazole |
| Nitrométhane | Nitromethane |
| Nitronium | Nitronium ion |
| Nitrophosphate | Nitrophosphate process |
| nitrosamine | nitrosamine |
| Nitrox | Enriched Air Nitrox |
| Nitroéthane | Nitroethane |
| Nitrure de gallium | Gallium nitride |
| Nits | The Nits |
| Nitya Pibulsonggram | Nit Phibunsongkhram |
| Niué | Niue |
| Niva | Niva River |
| Nivacrin | Horses of Middle-earth |
| Nivea Hamilton | Nivea |
| niveau | pitch |
| niveau acoustique | sound pressure level |
| niveau critique | critical level |
| niveau d'eau | water level |
| niveau d'efficacité | efficiency level |
| niveau d'études | level of education |
| Niveau de base | Base level |
| Niveau de condensation par ascension | Lifted condensation level |
| Niveau de convection libre | Level of free convection |
| Niveau de Fermi | Fermi energy |
| niveau de l'eau | water level |
| niveau de la mer | sea level |
| Niveau de preuve | Level of evidence |
| niveau de risque acceptable | acceptable risk level |
| niveau de subsistance | subsistence level |
| niveau de vie | standard of living |
| niveau le plus bas | rock bottom |
