| Oliveira da Figueira | Minor characters in The Adventures of Tintin |
| Oliver | Oliver |
| Oliver Bierhoff | Oliver Bierhoff |
| Oliver Cromwell | Oliver Cromwell |
| Oliver Dragojević | Oliver Dragojević |
| Oliver Hardy | Oliver Hardy |
| Oliver Hazard Perryklassen | Oliver Hazard Perry class frigate |
| Oliver Heaviside | Oliver Heaviside |
| Oliver Hirschbiegel | Oliver Hirschbiegel |
| Oliver Kahn | Oliver Kahn |
| Oliver McCall | Oliver McCall |
| Oliver Neuville | Oliver Neuville |
| Oliver Norvelle Hardy | Oliver Norvelle Hardy |
| Oliver Riedel | Oliver Riedel |
| Oliver Sacks | Oliver Sacks |
| Oliver Smithies | Oliver Smithies |
| Oliver Stone | Oliver Stone |
| Oliver Tambo | Oliver Tambo |
| Oliver Twist | Oliver Twist |
| Olivgrön | Olive |
| olivgrönt | olive |
| Olivia | Olivia |
| Olivia de Berardinis | Olivia De Berardinis |
| Olivia de Havilland | Olivia de Havilland |
| Olivia Lewis | Olivia Lewis |
| Olivia Newton-John | Olivia Newton-John |
| Olivier Besancenot | Olivier Besancenot |
| Olivier Grouillard | Olivier Grouillard |
| Olivier Messiaen | Olivier Messiaen |
| Olivier Panis | Olivier Panis |
| Olivin | Olivine |
| olivolja | olive oil |
| olivoljerester | olive oil mill wastewater |
| Olivpress | Olive oil extraction |
| olivträd | olive tree |
| Olivträdsalliansen | The Olive Tree |
| Oliwa | Oliwa |
| olja | grease |
| Olja av icke-biologiskt ursprung | Abiogenic petroleum origin |
| Olja mot mat-programmet | Oil-for-Food Programme |
| oljad blixt | greased lightning |
| olje- och fettindustri | oil and fat industry |
| oljeaktig | oily |
| oljebarriär | oil boom |
| oljebaserad energi | oil-based energy |
| oljebindande medel | oil binding agent |
| oljeborrning | drilling for oil |
| oljebyte | oil change |
| oljeduk | oilcloth |
| Oljedådra | Camelina sativa |
| oljefläck | slick |
| oljefrön | oilseeds |
| oljefält | oil field |
| oljefärg | oil color |
| oljeförande | oil-bearing |
| oljeförbrukning | petroleum consumption |
| oljeförorening | oil pollution |
| oljeindustri | petroleum industry |
| oljekanna | oilcan |
| oljekatastrof | oil disaster |
| oljekläder | oil-skins |
| oljekälla | well |
| oljeledning | oil pipeline |
| Oljemåleri | Oil painting |
| oljemålning | oil painting |
| oljeproduktion | oil production |
| Oljeproduktionstopp | Hubbert peak theory |
| oljeraffinaderi | oil refinery |
| oljerigg | oil rig |
| oljeråvaror | oil-seeds |
| Oljeskiffer | Bituminous shale |
| oljesticka | dipstick |
| oljeställ | oilskins |
| oljetanker | oil tanker |
| oljetryck | oleograph |
| Oljetrycksmätare | Barometer |
| oljetråg | oil pan |
| oljeutsläpp | oil slick |
| oljeutvinning | oil extraction |
| oljig | oily |
| oljning | oiling |
| oljor | oils |
| oljud | clamor |
| Olkusz | Olkusz |
| Ollantaytambo | Ollantaytambo |
| Olli Jokinen | Olli Jokinen |
| Olli Rehn | Olli Rehn |
| Ollie | Ollie |
| ollon | glans |
| ollonborre | cockchafer |
| Ollonmaskar | Acorn worm |
| ollonsträng | frenulum |
| Olmeker | Olmec |
| Olof av Danmark och Norge | Olav IV of Norway |
| Olof av Norge | Olaf II of Norway |
| Olof Björnsson | Olof Björnsson |
| Olof Haraldsson | Olaf II of Denmark |
| Olof Hunger | Olaf I of Denmark |
| Olof Palme | Olof Palme |
| Olof Palmepriset | Olof Palme Prize |
| Olof Skötkonung | Olof Skötkonung |
| Olof Swartz | Olof Swartz |
| Olof Vilhelm Arrhenius | Olof Vilhelm Arrhenius |
| Olofsborg | Olavinlinna |
| Olofströms kommun | Olofström Municipality |
| ologisk | stupid |
| Olokun | Olokun |
| Olomouc | Olomouc |
| Olonets | Olonets |
| Olongapo City | Olongapo City |
| olovlig | illicit |
| olovligt reproducera | pirate |
| OLPC | One Laptop per Child |
