| Ossuccio | Ossuccio |
| ossuto | vel over been |
| ostacolare | verhinderen |
| ostacolo | barrière |
| ostaggio | gijzelaar |
| Ostalbkreis | Ostalbkreis |
| Ostalgie | Ostalgie |
| Osteichthyes | Osteichthyes |
| ostello | hospitium |
| ostello della gioventù | jeugdherberg |
| Ostelsheim | Ostelsheim |
| Osten | Osten |
| Ostenda | Oostende |
| Ostensivo | Lijst van IATA-codes voor luchtvaartmaatschappijen |
| ostensorio | monstrans |
| ostentare | pronken met |
| ostentatamente | ostentatief |
| ostentatore | opzichtig |
| ostentazione | opzichtigheid |
| Osteoblasto | Osteoblast |
| Osteofita | Osteofyt |
| Osteogenesi imperfetta | Osteogenesis imperfecta |
| Osteointegrazione | Osseointegratie |
| Osteolaemus tetraspis | Breedvoorhoofdkrokodil |
| osteologa | osteopate |
| Osteoporosi | Osteoporose |
| Osteosarcoma | Osteosarcoom |
| Osterberg | Osterberg |
| Osterburken | Osterburken |
| Osterhofen | Osterhofen |
| osteria | bar |
| Ostermiething | Ostermiething |
| Ostermundigen | Ostermundigen |
| Osterwitz | Osterwitz |
| Osterzell | Osterzell |
| Osterøy | Osterøy |
| ostetrica | verloskundige |
| ostetricia | obstetrie |
| ostetrico | obstetrisch |
| Ostfildern | Ostfildern |
| Ostfälisch | Oostfaals |
| Ostheim vor der Rhön | Ostheim vor der Rhön |
| Osthofen | Osthofen |
| ostia | verdraaid |
| Ostia Antica | Ostia Antica |
| Ostiglia | Ostiglia |
| ostile | vijandelijk |
| Ostiliano | Hostilianus |
| ostilità | vijandigheid |
| ostinata | druktemaakster |
| ostinato | persistent |
| ostinazione | volharding |
| Ostmark | Ostmark |
| Ostpolitik | Ostpolitik |
| Ostprignitz-Ruppin | Ostprignitz-Ruppin |
| Ostrach | Ostrach |
| Ostraciidae | Koffervissen |
| Ostracoda | Mosselkreeftjes |
| Ostrava | Ostrava |
| ostrica | oester |
| Ostrinia nubilalis | Europese maïsboorder |
| Ostrobotnia | Österbotten |
| Ostrobotnia centrale | Centraal-Österbotten |
| Ostrobotnia meridionale | Zuid-Österbotten |
| Ostrobotnia settentrionale | Noord-Österbotten |
| Ostrogoti | Ostrogoten |
| Ostrov | Ostrov |
| Ostrowiec Świętokrzyski | Ostrowiec Świętokrzyski |
| Ostrołęka | Ostrołęka |
| ostruire | afsluiten |
| ostruzione | blokkeren |
