| organism | organism |
| Organismós Sidirodrómon Elládos | OSE |
| organist | organist |
| organization | förbund |
| Organization for Security and Co-operation in Europe | Organisationen för säkerhet och samarbete i Europa |
| Organization of American States | Organization of American States |
| Organization of Arab Petroleum Exporting Countries | OAPEC |
| Organization XIII | Organization XIII |
| organizational | organisatorisk |
| Organizational memory | Minne |
| Organizational studies | Organisationsteori |
| Organizationally Unique Identifier | OUI |
| organize | ordna |
| organized | organiserad |
| organized crime | organiserad brottslighet |
| organizer | organisatör |
| organizing | organiserar |
| organochlorine compound | klorerat kolväte |
| organohalogen compound | organisk halogenförening |
| organoleptic property | organoleptisk egenskap |
| organometallic compound | metallorganisk förening |
| organonitrogen compound | organisk kväveförening |
| organooxygen compound | organisk syreförening |
| organophosphorous compound | organisk förening |
| organosulphur compound | organisk svavelförening |
| organs | organ |
| organs of reproduction | fortplantningsorganen |
| orgasm | orgasm |
| Orges | Orges |
| orgiastic | orgiastisk |
| orgiginally | ursprungligen |
| orgy | backanal |
| Orgyia antiqua | Streckad fjädertofsspinnare |
| Orhan I | Orhan |
| Orhan Pamuk | Orhan Pamuk |
| Orhei | Orhei |
| Oriana Fallaci | Oriana Fallaci |
| Oribi | Oribi |
| Orichalcum | Orikalkum |
| Orient | Orienten |
| Orient - the | Orienten |
| Orient Express | Orientexpressen |
| oriental | orientalisk |
| Oriental Fire-bellied Toad | Orientalisk klockgroda |
| Oriental Honey Buzzard | Tofsbivråk |
| Oriental Longhair | Orientaliskt långhår |
| Oriental Orthodox Church | Orientaliskt ortodoxa |
| Oriental Orthodoxy | Orientaliskt ortodoxa |
| Oriental Shorthair | Orientaliskt korthår |
| Oriental Turtle Dove | Större turturduva |
| Oriental White-eye | Indisk glasögonfågel |
| orientalist | orientalist |
