| orso grigio | grizzly |
| Orso I Participazio | Orso I Participazio |
| Orso II Participazio | Orso II Participazio |
| Orso Ipato | Orso Ipato |
| orso nero americano | black bear |
| orso polare | polar bear |
| Orso Yoghi | Yogi Bear |
| Orsola | Ursula |
| Orson Scott Card | Orson Scott Card |
| Orson Welles | Orson Welles |
| ORT | Ort |
| Ort im Innkreis | Ort |
| ortaggi verdi | green vegetable |
| ortaggio a foglie | leafy vegetable |
| Ortenaukreis | Ortenaukreis |
| Ortenburg | Ortenburg |
| ortensia | hydrangea |
| Orth an der Donau | Orth an der Donau |
| Orthanc | Orthanc |
| Orthez | Orthez |
| Orthonectida | Orthonectida |
| Orthoptera | Orthoptera |
| Orthorrhapha | Orthorrhapha |
| ortica | stinging nettle |
| ortica bianca | dead nettle |
| orticaria | hives |
| orticello | patch |
| orticoltore | horticulturist |
| orticoltrice | horticulturist |
| orticoltura | horticulture |
| orticoltura su larga scala | market gardening |
| orticultura | horticulture |
| Ortisei | Urtijëi |
| Ortles | Ortler |
| Ortles-Cevedale | Ortler Alps |
| orto | vegetable garden |
