| os | bœuf |
| Os capitatum | Os capitatum |
| Os hamatum | Hamatum |
| Os lunatum | Os lunatum |
| Os naviculare | Os naviculaire |
| Os pisiforme | Os pisiforme |
| Os scaphoideum | Os scaphoïde |
| Os trapezium | Os trapèze |
| Os trapezoideum | Os trapèzoïde |
| Os triquetrum | Os triquetrum |
| Osagedoorn | Oranger des Osages |
| Osaka | Ōsaka |
| Osaka Aquarium Kaiyukan | Aquarium Kaiyukan |
| Osaka-ringlijn | Ligne JR Ōsaka Loop |
| Osama bin Laden | Oussama Ben Laden |
| Osama Moustafa Hassan Nasr | Nasr Oussama Mustafa Hassan |
| Osamu Tezuka | Osamu Tezuka |
| Osasco | Osasco |
| Osbourne Reynolds | Osborne Reynolds |
| OSCA | OSCA |
| Oscar | Oscar |
| Oscar Camenzind | Oskar Camenzind |
| Oscar de la Hoya | Oscar de la Hoya |
| Oscar Gutierrez | Rey Mysterio |
| Oscar Hammerstein II | Oscar Hammerstein II |
| Oscar I van Zweden | Oscar Ier de Suède |
| Oscar II van Zweden | Oscar II de Suède |
| Oscar Montelius | Oscar Montelius |
| Oscar Niemeyer | Oscar Niemeyer |
| Oscar Peterson | Oscar Peterson |
| Oscar Wilde | Oscar Wilde |
| Oschatz | Oschatz |
| oscillatie | oscillation |
| oscillator | oscillateur |
| oscillerend | oscillant |
| Osco | Osco |
| osculatie | osculation |
| OSDL | Open Source Development Labs |
| Oseltamivir | Oseltamivir |
| Osgiliath | Osgiliath |
| Oshikoto | Oshikoto |
| Oshkosh | Oshkosh |
| OSI-model | Modèle OSI |
| Osijek | Osijek |
| Osip Mandelstam | Ossip Mandelstam |
| Osiris | Osiris |
| Osismii | Osismes |
| Osj | Och |
| Oskar Kokoschka | Oskar Kokoschka |
| Oskar Lafontaine | Oskar Lafontaine |
| Oskar Morgenstern | Oskar Morgenstern |
| Oskar Neumann | Oskar Neumann |
| Oskar Pastior | Oskar Pastior |
| Oskar Schindler | Oskar Schindler |
| Oskisch | Osque |
| Oslo | Oslo |
| Oslo-confrontatie | Évaluation comparative |
| Osmaans | Ottoman |
| Osmaanse Rijk | Empire ottoman |
| Osman | Othmane |
| Osman I | Osman Ier |
| Osman II | Osman II |
| Osman III | Osman III |
| Osmaniye | Osmaniye |
| osmium | osmium |
| Osmolariteit | Osmolalité |
| osmose | osmose |
| osmotisch | osmotique |
| Osmussaar | Osmussaar |
| Osnabrück | Osnabrück |
| Osnago | Osnago |
| Osogbo | Osogbo |
| Osogna | Osogna |
| Osorkon I | Osorkon Ier |
| Osorkon II | Osorkon II |
| Osorkon III | Osorkon III |
| Osorkon IV | Osorkon IV |
| Osorno | Osorno |
| OSPAR-Verdrag | Convention internationale OSPAR |
| Osroene | Osroène |
| Ossegem | Osseghem |
| Ossenhoeder | Bouvier |
| Ossenstaart | Queue de boeuf |
| Ossentong | Anchusa |
| Ossessione | Les Amants diaboliques |
| ossestaart | queue de bœuf |
| Ossetië | Ossétie |
| Ossian | Ossian |
| ossificatie | ossification |
| Ossingen | Ossingen |
| Ossip Zadkine | Ossip Zadkine |
| Osso buco | Osso buco |
| Ossuaire van Douaumont | Ossuaire de Douaumont |
| Ossuccio | Ossuccio |
| Ostalgie | Ostalgie |
| Ostankino-toren | Tour Ostankino |
| Ostare | Ostara |
| Ostasjkov | Ostachkov |
| Osteichthyes | Osteichthyes |
| Osten | Est |
| ostentatief | d'une manière exagérée |
| Osteoblast | Ostéoblaste |
| Osteocephalus | Osteocephalus |
| Osteocyt | Ostéocyte |
| Osteogenesis imperfecta | Ostéogenèse imparfaite |
| Osteomyelitis | Ostéomyélite |
| osteopaat | ostéopathe |
| osteopate | ostéopathe |
| Osteopathie | Ostéopathie |
| Osteopilus | Osteopilus |
| Osteoporose | Ostéoporose |
| Osteosarcoom | Ostéosarcome |
| osteoïd | osseux |
| Osterhofen | Osterhofen |
| Ostermundigen | Ostermundigen |
| Osterode am Harz | Osterode am Harz |
| Osterøy | Osterøy |
| Ostfildern | Ostfildern |
| Osthofen | Osthofen |
| Ostia Antica | Ostie |
| Ostiglia | Ostiglia |
| Ostmark | Ostmark |
| Ostpolitik | Ostpolitik |
| Ostrach | Ostrach |
| Ostrava | Ostrava |
| Ostrogoten | Ostrogoths |
| Ostrov | Île |
| Ostrołęka | Ostrołęka |
| Ostróda | Ostróda |
| Ostrów Wielkopolski | Ostrów Wielkopolski |
| Ostseestadion | DKB-Arena |
| Ostwald | Ostwald |
| Ostwind | Flakpanzer IV |
| Osun-Osogbo | Osun-Oshogbo |
| Osvaldo Ardiles | Osvaldo Ardiles |
| Osvaldo Cavandoli | Osvaldo Cavandoli |
| Osvaldo Pugliese | Osvaldo Pugliese |
| Oswald Achenbach | Oswald Achenbach |
| Oswald Mosley | Oswald Mosley |
| Oswald Spengler | Oswald Spengler |
| Oswald van Northumbria | Oswald de Northumbrie |
| Oswaldo Piazza | Oswaldo Piazza |
| Oswego | Oswego |
| Oswiecim | Oświęcim |
| Oswiu van Northumbria | Oswiu de Northumbrie |
| Otaci | Otaci |
| Otacilia Severa | Otacilie |
| Otago | Otago |
| Otava | Ottawa |
| OTC Doors - Lauretana | Équipe cycliste OTC Doors - Lauretana |
| Otelfingen | Otelfingen |
| Otello | Otello |
| Otep | Otep |
| Othello | Othello ou le Maure de Venise |
| Other Voices | Other Voices |
| Othmarsingen | Othmarsingen |
| Othniel Charles Marsh | Othniel Charles Marsh |
| Otho | Othon |
| Othry | Mont Othry |
| Otis Redding | Otis Redding |
| Otitis | Otite |
| Otitis externa | Otite externe |
| Otmar Hasler | Otmar Hasler |
| Otniël | Othoniel |
| Oto | OTO |
| otofoto | selfie |
| Otolith | Otolithe |
| Otomat | Thésée |
| Otomys | Otomys |
| Otosclerose | Otospongiose |
| Otoscoop | Otoscope |
| Otradnoje | Pella |
| Otranto | Otrante |
| OTRS | OTRS |
| Ottaviano Petrucci | Ottaviano Petrucci |
| Ottavio Bottecchia | Ottavio Bottechia |
| Ottavio Farnese | Octave Farnèse |
| Ottawa | Ottawa |
| Ottenbach | Ottenbach |
| Ottensheim | Ottensheim |
| otter | loutre |
| Ottercivetkat | Civette-loutre de Sumatra |
| Otto | Othon |
| Otto de Rijke | Othon |
| Otto Diels | Otto Paul Hermann Diels |
| Otto Dix | Otto Dix |
| Otto Frans van Oostenrijk | Otto de Habsbourg-Lorraine |
| Otto Frisch | Otto Frisch |
| Otto Fritz Meyerhof | Otto Fritz Meyerhof |
| Otto Hahn | Otto Hahn |
| Otto Heinrich Warburg | Otto Heinrich Warburg |
| Otto I de Schone | Othon Ier de Bohême |
| Otto I van Beieren | Othon Ier de Bavière |
| Otto I van Bourgondië | Othon Ier de Bourgogne |
| Otto I van Brandenburg | Otton Ier du Saint-Empire |
| Otto I van Brunswijk | Othon Ier de Brunswick |
| Otto I van Gelre | Otton Ier de Gueldre |
| Otto I van Griekenland | Othon Ier de Grèce |
| Otto I van Hessen | Othon Ier de Hesse |
| Otto I van het Heilige Roomse Rijk | Otton Ier du Saint-Empire |
| Otto I van Nassau | Othon Ier de Nassau |
| Otto I van Palts-Mosbach | Otton Ier du Saint-Empire |
| Otto I van Weimar | Otton Ier du Saint-Empire |
