| Olaf I of Denmark | Oluf Ier de Danemark |
| Olaf I of Norway | Olaf Ier de Norvège |
| Olaf II of Denmark | Oluf II de Danemark |
| Olaf II of Norway | Olaf II de Norvège |
| Olaf III Guthfrithson | Olaf Gothfrithson |
| Olaf III of Norway | Olaf III de Norvège |
| Olaf Kölzig | Olaf Kölzig |
| Olaf Magnusson of Norway | Olaf IV de Norvège |
| Olaf Stapledon | Olaf Stapledon |
| Olanesti | Olanesti |
| Olang | Valdaora |
| Olanzapine | Olanzapine |
| OLAP cube | Hypercube OLAP |
| Olargues | Olargues |
| Olaus Magnus | Olaus Magnus |
| Olaus Rudbeck | Olof Rudbeck |
| Olav | Olof de Suède |
| Olav IV of Norway | Oluf III de Danemark |
| Olav V of Norway | Olav V de Norvège |
| Olavarría Partido | Olavarría |
| Olbernhau | Olbernhau |
| Olbia | Olbia |
| old | âgé |
| old age | vieillesse |
| Old Bailey | Old Bailey |
| Old Believers | Orthodoxes vieux-croyants |
| Old Bushmills Distillery | Bushmills |
| Old Calendar Bulgarian Orthodox Church | Église orthodoxe vieille-calendariste de Bulgarie |
| Old Calendar Romanian Orthodox Church | Église orthodoxe vieille-calendariste de Roumanie |
| Old Cathedral of Coimbra | Cathédrale de Coimbra |
| Old Catholic Church | Église vieille-catholique |
| Old Catholic Church of Austria | Église vieille-catholique |
| Old Chinese | Chinois archaïque |
| Old Church Slavonic | Vieux slave |
| Old City | Vieille ville de Jérusalem |
| Old City of Jerusalem | Vieille ville de Jérusalem |
| Old conveyance | Bateau |
| Old Course at St Andrews | Old Course |
| Old Dominion | Virginie |
| Old English | Ancien Anglais |
| Old European Script | Vinča |
| Old Faithful Geyser | Old Faithful |
| Old Firm | Old Firm |
| old folks' home | maison de retraite |
| Old Friends from Young Years | Old Friends From Young Years |
| Old Frisian | Ancien Frison |
| Old Gutnish | Gutnisk |
| old hazardous site | site ancien dangereux |
| Old High German | Vieux haut allemand |
| Old Hungarian script | Runes hongroises |
| Old Indian Defense | Défense vieille-indienne |
| Old Italic alphabet | Alphabet étrusque |
| Old King Cole | Coel Hen |
| Old Kingdom | Ancien Empire égyptien |
| old landfill site | dépôt ancien |
| Old Lyme | Old Lyme |
| Old Man and the Sea | Le Vieil Homme et la mer |
| Old Montreal | Vieux-Montréal |
| Old New Synagogue | Synagogue Vieille-Nouvelle |
| Old Norse | Vieux norrois |
| Old Norse language | Vieux norrois |
| Old Nosy | Wellington |
| Old Nubian language | Ancien nubien |
| old people's home | maison de retraite |
