| Noventis |
| Novo C |
| NovoFine |
| NOVO NORDISK A/S, BAGSVAERD |
| Novo-Passit |
| NUK |
| Nupreme |
| Nurofen |
| NUTREND |
| Nutricia |
| Nutricius |
| Nutridrink |
| Nutrilon |
| Nutrini |
| Nutriop - Velká Británie |
| Nutrison |
| Nux Vomica |
| NYDA |
| o.b. |
| OBZOR |
| Octenilin |
| Octenisept |
| Octicide |
| OCUflash |
| OCUhyl C |
| Oculus |
| Ocutears |
| Ocutein |
| Ocuvite |
| Off |
| Officina Naturae |
| OFTAGEL |
| Ohropax |
| Oilatum |
| Okluzor |
| Okopharm |
| Okuzell |
| Olfen |
| Olimunovac |
| Olivocap |
| Olynth |
| Omat |
| Omeprazol |
| Omikron |
| Omisan |
| Omk1 |
| Omnican |
| Omron |
