| oceanography | Meereskunde |
| oceanological | ozeanologisch |
| oceanologically | ozeanologisch |
| oceanologist | Ozeanologe |
| oceanology | Ozeanografie |
| oceans | Ozeane |
| Oceanside | Oceanside |
| Oceanus | Okeanos |
| Oceanus Procellarum | Oceanus Procellarum |
| oceanway | Strandpromenade |
| ocellaris clown | Oranger Ringelfisch |
| Ocellaris clownfish | Clownfische |
| ocellated antbird | Halsband-Ameisenvogel |
| ocellated carpet viper | Westafrikanische Sandrasselotter |
| ocellated crake | Schomburgkralle |
| Ocellated Lizard | Perleidechse |
| ocellated poorwill | Augennachtschwalbe |
| ocellated pufferfish | Glühaugen-Kugelfisch |
| ocellated quial | Tränenwachtel |
| ocellated skink | Gefleckter Walzenskink |
| ocellated tapaculo | Perlenmanteltapaculo |
| ocellated thrasher | Tropfenspottdrossel |
| ocellated turkey | Pfauentruthuhn |
| ocellated woodcreeper | Augenbaumsteiger |
| ocelot | Pardelkatze |
| ocelot coat | Ozelot |
| ocelot stole | Ozelot |
| Ochakiv | Otschakiw |
| ocher | Ocker |
| ocher yellow | bräunlichgelb |
| Ochiltree County | Ochiltree County |
| Ochlenberg | Ochlenberg |
| ochlocracy | Ochlokratie |
| Ochlophobia | Enochlophobie |
| Ochnaceae | Ochnaceae |
| Ocho Ríos | Ocho Rios |
| ochraceous attila | Goldbürzelattila |
| ochraceous bearded bulbul | Rostbauchbülbül |
| ochraceous pewee | Ockerbrusttyrann |
| ochraceous piculet | Ockerzwergspecht |
| ochraceous-breasted flycatcher | Goldkehltyrann |
| Ochratoxin | Ochratoxine |
| ochratoxin A | Ochratoxin A |
| ochratoxin B | Ochratoxin B |
| ochratoxin C | Ochratoxin C |
| ochratoxins | Ochratoxine |
| ochre | Ocker |
| ochre brown | ockerbraun |
| ochre mill | Ockermühle |
