| -ne | (sign of a question) | add to the end of a word |
| narro, narrare, narravi, narratus | (verb) | tell, relate |
| natio, nationis | (noun, f.) | nation |
| nato, natare, natavi, natatus | (verb) | swim |
| natura, naturae | (noun, f.) | nature |
| nauta, nautae | (noun, m.) | sailor |
| navigo, navigare, navigavi, navigatus | (verb) | sail, cruise |
| navis, navis | (noun, f.) | ship |
| necessarius, necessarii or necessari | (noun, m.) necessaria, necessariae (f.) | relative, friend |
| neco, necare, necavi, necatus | (verb) | kill |
| nemo, neminis | (noun, m./f.) | no one, nobody |
| nescio, nescire, nescivi, nescitus | (verb) | not know, be ignorant of |
| neuter, neutra, neutrum | (adjective) | neither |
| nihil or nil | (noun, n.) has the same spelling in all cases | nothing |
| nihilum, nihili | (noun n.) | nothing |
| nolo, nelle, nolui | (verb) | not to wish, be unwilling |
| nomen, nomenis | (noun, n.) | name |
| noster, nostra, nostrum | (adjective) | our, ours |
| novus, nova, novum | (adjective) | new |
| nox, noctis | (noun, f.) | night |
| nullus, nulla, nullum | (adjective) | no, none |
| numerus, numeri | (noun, m.) | number |
| nuntio, nuntiare, nuntiavi, nuntiatus | (verb) | anounce, report |
| nuntius, nuntii or nunti | (noun, m.) | messenger, message |
| obdormisco, obdormiscere, obdormiscivi | (verb) | go to sleep, fall asleep |
| obscurus, obscura, obscurum | (adjective) | dark |
| obses, obsidis | (noun, m./f.) | hostage |
| obtineo, obtinere, obtinui, obtentus | (verb) | secure, obtain |
| occupo, occupare, occupavi, occupatus | (verb) | seize, take possession of |
| oceanus, oceani | (noun, m.) | ocean |
| oculus, oculi | (noun, m.) | eye |
| odium, odii or odi | (noun, n.) | hatred |
| officium, officii or offici | (noun, n.) | official job, official position |
| omnis, omne | (adjective) | all, every |
| onus, oneris | (noun, n.) | burden, weight |
| opinor, opinari, opinatus | (verb) | think, suppose, imagine |
| oportet, oportere, oportuit | (verb) this is an impersonal verb the subject is always "it" | it is right, it is proper |
| oppidum, oppidi | (noun, n.) | town |
| opprimo, opprimere, oppressi, oppressus | (verb) | overcome, crush |
| oppugno, oppugnare, oppugnavi, oppugnatus | (verb) | attack |
| opus, operis | (noun, n.) | work |
| oraculum, oraculi | (noun, n.) | oracle |
| ordo, ordinis | (noun, m.) | rank, order |
| oro, orare, oravi, oratus | (verb) | beg, pray |
| otiosus, otiosa, otiosum | (adjective) | free, at leisure, not working |
| ovis, ovis | (noun, f.) | sheep |