| Substance | Abbreviation | Systematics | Provings |
| Nabalus albus White Lettuce |
Nabal-a | Asteraceae/ Compositae |
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| Nabalus serpentarius White Lettuce |
Nabal | Asteraceae/ Compositae |
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| Naja haje Egyptian cobra |
Naja-h | Elapidae |
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| Naja mossambica Mozambique Spitting Cobra |
Naja-mo | Elapidae |
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| Naja tripudians Cobra |
Naja | Elapidae |
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| Napellinum Napelline |
Napin | Ranunculaceae |
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| Naphthalinum Naphthalene |
Naphtin | Aromatic Carbon Compounds |
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| Naphthochinonum Naphthoquinone |
Naphth | Aromatic Carbon Compounds |
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| Narceinum |
Narcin | Papaveraceae |
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