| opaque | zugänglich |
| Opatija | Opatija |
| Opava | Opava |
| Opchanacanough | Opechancanough |
| Opel | Opel |
| Opel Astra G | Opel Astra G |
| Opel Astra H | Opel Astra H |
| Opel Corsa | Opel Corsa |
| Opel Meriva | Opel Meriva |
| Opel Vectra | Opel Vectra |
| Opel Zafira | Opel Zafira |
| Open Arena | OpenArena |
| Open Clip Art Library | Open Clip Art Library |
| Open database connectivity | Open Database Connectivity |
| Open de Bâle | Swiss Indoors |
| Open de Chine | China Open |
| Open de Croatie Umag | Croatia Open |
| Open de Doha | ATP Doha |
| Open de Gstaad | Swiss Open |
| Open de Halle | Gerry Weber Open |
| Open de Kitzbühel | Generali Open |
| Open de Las Vegas | ATP Las Vegas |
| Open de Munich | BMW Open |
| Open de Palermo | Palermo Open |
| Open de San José | ATP San José |
| Open de Sopot | Orange Prokom Open |
| Open de Suède | Swedish Open |
| Open de Valence | ATP Valencia |
| Open de Viña del Mar | ATP Viña del Mar |
| Open de Zurich | Zurich Open |
| Open Directory Project | Open Directory Project |
| Open du Brésil | ATP Costa do Sauípe |
| Open du Canada | Rogers Masters |
| Open du Mexique | ATP Acapulco |
| Open européen | Smurfit European Open |
| Open Group | Open Group |
| Open invention network | Open Invention Network |
| Open Motif | Motif |
| Open shortest path first | Open Shortest Path First |
| Open Sound System | Open Sound System |
| Open Source | Open Source |
| Open Source Definition | Open Source Definition |
| Open Source Development Labs | Open Source Development Labs |
| Open University | Open University |
| Open XML | Office Open XML |
| Open-jaw | Gabelflug |
| OpenGL utility library | OpenGL Utility Library |
| OpenGL utility toolkit | OpenGL Utility Toolkit |
| OpenLaszlo | OpenLaszlo |
| OpenNap | OpenNap |
| OpenPGP | OpenPGP |
| OpenSolaris | OpenSolaris |
| OPENSTEP | OpenStep |
| OpenSUSE | OpenSuse |
| OpenVPN | OpenVPN |
| OpenWrt | OpenWrt |
| OPEP | OPEC |
| Opera | Opera |
| Opera Garnier | Opera Garnier |
| Opera Nazionale Balilla | Balilla |
| Opera seria | Opera seria |
| Opera Software | Opera Software |
| Operación Triunfo | Operación Triunfo |
| Operateur | Operator |
| Operation Flashpoint | Operation Flashpoint |
| Operation Ivy | Operation Ivy |
| Operation Wolf | Operation Wolf |
| OPEX | Opex |
| Opfertshofen | Opfertshofen |
| Opfikon | Opfikon |
| Opheodrys | Grasnattern |
| Ophichthidae | Schlangenaale |
| ophicléide | Ophikleide |
| ophicéphale | Schlangenkopffisch |
| ophidien | Schlange |
| Ophidiiformes | Eingeweidefischartige |
| ophio- | ophio- |
| Ophioglossaceae | Natternzungengewächse |
| Ophioglosse commun | Gewöhnliche Natternzunge |
| Ophioglossophyta | Natternzungengewächse |
| Ophioglossum | Natternzungen |
| Ophiolite | Ophiolit |
| ophiologie | Ophiologie |
| ophiolâtrie | Ophiolatrie |
| Ophir | Ophir |
| Ophiuchus | Schlangenträger |
| Ophiuroidea | Schlangensterne |
| ophrys | Ragwurz |
| Ophrys abeille | Bienen-Ragwurz |
| Ophrys apifera | Bienen-Ragwurz |
| Ophrys araignée | Große Spinnen-Ragwurz |
| Ophrys bourdon | Hummel-Ragwurz |
| Ophrys brun | Braune Ragwurz |
| Ophrys bécasse | Schnepfen-Ragwurz |
| Ophrys jaune | Gelbe Ragwurz |
| Ophrys miroir | Spiegel-Ragwurz |
| Ophrys mouche | Fliegen-Ragwurz |
| Ophrys noir | Schwarze Ragwurz |
| Ophrys petite araignée | Kleine Spinnen-Ragwurz |
| Ophrys tenthredinifera | Wespen-Ragwurz |
| ophtalmie des neiges | Schneeblindheit |
| ophtalmique | Augen- |
| ophtalmo | Augenarzt |
| ophtalmologie | Augenheilkunde |
| ophtalmologiste | Augenärztin |
| ophtalmologue | Augenarzt |
| Ophtalmoscope | Ophthalmoskopie |
| ophthalmologiste | Augenarzt |
| ophthalmologue | Augenarzt |
