| osseous | osseo |
| Ossetia | Ossezia |
| Ossetians | Osseti |
| Ossetic language | Lingua osseta |
| Ossewabrandwag | Ossewabrandwag |
| Ossiach | Ossiach |
| Ossian | Ossian |
| ossicle | ossicino |
| Ossicles | Aliosso |
| ossification | ossificazione |
| ossify | cristallizzarsi |
| Ossingen | Ossingen |
| Ossobuco | Osso buco |
| Ossuccio | Ossuccio |
| OST | OST |
| Ostafievo International Airport | Aeroporto di Mosca-Ostafievo |
| Ostalbkreis | Ostalbkreis |
| Ostalgie | Ostalgie |
| Ostallgäu | Algovia Orientale |
| Osteichthyes | Osteichdsethyes |
| Ostelsheim | Ostelsheim |
| Osten | Est |
| Ostend | Ostenda |
| Ostend Company | Compagnia di Ostenda |
| Ostende | Ostenda |
| ostensible | cosiddetto |
| ostensive | visibile |
| ostentation | ostentazione |
| ostentatious | appariscente |
| ostentatiously | ostentatamente |
| ostentatiousness | ostentazione |
| Osteoderm | Osteoderma |
| osteomyelitis | osteomielite |
| osteopath | specialista in osteopatia |
| osteopathy | osteopatia |
| osteoporosis | osteoporosi |
| osteotomy | osteotomia |
| Osterberg | Osterberg |
| Osterburken | Osterburken |
| Osterhofen | Osterhofen |
| Ostermundigen | Ostermundigen |
| Osterzell | Osterzell |
| Osterøy | Osterøy |
| Ostfildern | Ostfildern |
| Ostfildern-Ruit | Ostfildern-Ruit |
| Ostheim | Ostheim vor der Rhön |
| Osthofen | Osthofen |
| Ostia Antica | Ostia Antica |
| Ostiglia | Ostiglia |
| ostler | stalliere |
| Ostmark | Ostmark |
| Ostpolitik | Ostpolitik |
| Ostprignitz-Ruppin | Ostprignitz-Ruppin |
| Ostrach | Ostrach |
| ostracism | esilio |
| ostracize | esiliare |
| ostracized | esule |
| Ostracon | Ostraka |
| Ostrava | Ostrava |
| Ostrava-City District | Distretto di Ostrava |
| Ostreidae | Ostrea |
| ostrich | struzzo |
| ostrich policy | politica dello struzzo |
| Ostrobothnia | Ostrobotnia |
| Ostrog monastery | Monastero di Ostrog |
| Ostrogoths | Ostrogoti |
| Ostrogozhsk | Ostrogožsk |
| Ostroh | Monastero di Ostrog |
| Ostromir Gospels | Vangeli di Ostromir |
| Ostrov | Isola |
| Ostrovnoy | Ostrovnoj |
| Ostrowiec Świętokrzyski | Ostrowiec Świętokrzyski |
| Ostrołęka | Ostrołęka |
| Ostrołęka Voivodeship | Voivodato di Ostrołęka |
| Ostróda | Ostróda |
| Ostrów Mazowiecka | Ostrów Mazowiecka |
| Ostrów Tumski in Wrocław | Ostrów Tumski |
