| osmium | osmio |
| Osmo Vänskä | Osmo Vänskä |
| osmosis | ósmosis |
| osmotic | osmótico |
| Osmotrophy | Osmotrofia |
| Osmunda | Osmunda |
| Osmunda regalis | Osmunda regalis |
| Osmundaceae | Osmundaceae |
| Osnabrück | Osnabrück |
| Osogna | Osogna |
| Osona | Condado de Osona |
| Osorkon I | Osorkon I |
| Osorkon II | Osorkon II |
| Osorkon III | Osorkon III |
| Osorkon IV | Osorkon IV |
| Osorkon the Elder | Osocor |
| Osorno Province | Provincia de Osorno |
| Ospedale degli Innocenti | Spedale degli Innocenti |
| osprey | pigargo |
| Osram | Osram |
| Osric of Deira | Osric de Deira |
| Osric of Northumbria | Osric de Deira |
| Osroene | Osroene |
| Osseointegration | Osteointegración |
| osseous | óseo |
| Ossetia | Osetia |
| Ossetic language | Idioma osetio |
| Ossian | Ossian |
| ossification | osificación |
| ossify | osificarse |
| Ossip Bernstein | Ossip Bernstein |
| Ossip Zadkine | Ossip Zadkine |
| Ossobuco | Ossobuco |
| Ossolineum | Ossolineum |
| Ostalbkreis | Distrito de Ostalb |
| Ostalgie | Ostalgie |
| Ostankino Tower | Torre Ostankino |
| Osteichthyes | Osteichthyes |
| Osten | Este |
| Ostend | Ostende |
| Ostend Company | Compañía de Ostende |
| Ostende | Ostende |
| ostensible | pretendido |
| ostentation | ostentación |
| ostentatious | ostentoso |
| ostentatiously | ostentosamente |
| ostentatiousness | fanfarroneria |
| Osteoglossiformes | Osteoglossiformes |
| Osteon | Sistema de Havers |
| osteopath | osteópata |
| Osteopathic medicine | Osteopatía |
| Osteoporosis | Osteoporosis |
| Osteospermum | Osteospermum |
| Osterholz | Distrito de Osterholz |
| Ostermundigen | Ostermundigen |
| Osterode | Distrito de Osterode am Harz |
| Osterode am Harz | Distrito de Osterode am Harz |
| Ostholstein | Distrito de Ostholstein |
| ostler | mozo de cuadra |
| Ostpolitik | Ostpolitik |
| Ostprignitz-Ruppin | Distrito de Ostprignitz-Ruppin |
| ostracism | ostracismo |
| ostracize | expulsar |
