| Osella | Osella |
| Oseltamivir | Oseltamivir |
| oseltamivir phosphate | Oseltamivirphosphat |
| Osen | Osen |
| Osgood theorem | Satz von Osgood |
| Osgood's rat | Osgood-Ratte |
| Osgood's theorem | Satz von Osgood |
| Osgood-Schlatter disease | Morbus Osgood-Schlatter |
| Osgood-Schlatter syndrome | Osgood-Schlatter-Syndrom |
| Osgood-Schlatter's disease | Osgood'sche Krankheit |
| OSH | ASchG |
| Osh Province | Gebiet Osch |
| OSHA legislation | Arbeitsschutzgesetz |
| Oshana | Oshana |
| Oshare kei | Oshare Kei |
| Oshawa Generals | Oshawa Generals |
| oshi-sushi | Oshi-Sushi |
| Oshikoto Region | Oshikoto |
| Oshima Province | Provinz Ōshima |
| Oshiwambo | Oshivambo |
| Oshiwambo language | Oshivambo |
| oshizushi | Oshi-Sushi |
| Oshkosh | Oshkosh |
| Osho | Osho |
| Oshun | Oshun |
| OSI | offenes Kommunikationssystem |
| OSI : open systems interconnection | Kommunikation offener Systeme |
| OSI management | OSI-Management |
| OSI model | ISO-Referenzmodell |
| OSI protocol | OSI-Protokoll |
| OSI reference model | OSI-Referenzmodell |
| OSI technical office protocol | Europäische TOP User Group |
| OSI transport protocol | OSI-Transportprotokoll |
| Osiandric Controversy | Osiandrischer Streit |
| Osidge | Osidge |
| osier | Korbweide |
| osier basket | Weidenkorb |
| osier bed | Weidenpflanzung |
| osier furniture | Korbmöbel |
| osiers | Ruten |
| Osijek | Osijek |
| Osijek-Baranja County | Gespanschaft Osijek-Baranja |
| Osip Mandelstam | Ossip Emiljewitsch Mandelstam |
| Osirak | Osirak |
| Osiris | Osiris |
| Osiris Shoes | Osiris |
| Oskaloosa | Oskaloosa |
| Oskar Backlund | Oskar Backlund |
| Oskar Barnack | Oskar Barnack |
| Oskar Dirlewanger | Oskar Dirlewanger |
| Oskar Heinroth | Oskar Heinroth |
| Oskar Klein | Oskar Klein |
| Oskar Kokoschka | Oskar Kokoschka |
| Oskar Lafontaine | Oskar Lafontaine |
| Oskar Maria Graf | Oskar Maria Graf |
| Oskar Morgenstern | Oskar Morgenstern |
| Oskar Nedbal | Oskar Nedbal |
| Oskar Panizza | Oskar Panizza |
| Oskar Pastior | Oskar Pastior |
| Oskar Potiorek | Oskar Potiorek |
| Oskar Rieding | Oskar Rieding |
| Oskar Schindler | Oskar Schindler |
