| Olfen | Olfen |
| Olga Aleksandrovna van Rusland | Grand Duchess Olga Alexandrovna of Russia |
| Olga Bondarenko | Olga Bondarenko |
| Olga Jegorova | Olga Yegorova |
| Olga Kaniskina | Olga Kaniskina |
| Olga Kern | Olga Kern |
| Olga Knipper | Olga Knipper |
| Olga Koezenkova | Olga Kuzenkova |
| Olga Konstantinova van Rusland | Olga Konstantinovna of Russia |
| Olga Markova | Olga Markova |
| Olga Neuwirth | Olga Neuwirth |
| Olga Nikolajevna van Rusland | Grand Duchess Olga Nikolaevna of Russia |
| Olga Poetsjkova | Olga Poutchkova |
| Olga Pyljova | Olga Pyleva |
| Olga Rjabinkina | Olga Ryabinkina |
| Olga Roebtsova | Olga Rubtsova |
| Olga Savtsjoek | Olga Savchuk |
| Olga Valerianovna Karnovitsj | Olga Valerianovna Paley |
| Olga van Griekenland en Denemarken | Princess Olga of Greece and Denmark |
| Olga van Kiev | Olga of Kiev |
| Olga Zajtseva | Olga Zaitseva |
| Olgiate Comasco | Olgiate Comasco |
| Olhão | Olhão |
| Olib | Olib |
| olibanum | frankincense |
| olie | oil |
| olie op het vuur gieten | add fuel to the fire |
| Olie uitfaseren | Oil phase-out in Sweden |
| Olie voor voedsel | Oil-for-Food Programme |
| olie- en azijnstelletje | cruet |
| olieachtig | oily |
| Oliebol | Oliebol |
| oliebron | well |
| oliebusje | oilcan |
| oliecarter | oil pan |
| oliehoudend | oil-bearing |
| oliejas | slicker |
| oliejekker | slicker |
| Oliekevers | Blister beetle |
| Oliemaatschappij | List of petroleum companies |
| Oliena | Oliena |
| olienoot | peanut |
| oliepak | oilskins |
| olietanker | oil tanker |
| olieveld | oil field |
| olieverf | oil color |
| olieverfschilderij | oil painting |
| olieverversing | oil change |
| olievlek | slick |
| Olieworstelen | Kırkpınar |
| olifant | elephant |
| Olifanten | Elephant |
| Olifantgambiet | Elephant Gambit |
| Olifantsappel | Limonia |
| Olifantsgras | Miscanthus sinensis |
| olifantshuid hebben | have a thick skin |
| olifantsluis | cashew |
| olifantssnuit | proboscis |
| oligarchie | oligarchy |
| oligarchisch | oligarchic |
| Oligoceen | Oligocene |
| Oligomeer | Oligomer |
| Oligoryzomys | Pygmy rice rat |
| Oligotroof | Oligotrophic |
| olijf | olive |
| Olijfastrilde | Green Avadavat |
| Olijfberg | Mount of Olives |
| olijfboom | olive tree |
| Olijfboomcoalitie | The Olive Tree |
| Olijfbruin waterhoen | Bush-hen |
| Olijffamilie | Oleaceae |
| olijfolie | olive oil |
| olijk | frolic |
| Olimpi Rustavi | FC Olimpi Rustavi |
| Olimpiada Ivanova | Olimpiada Ivanova |
| Olimpija Ljubljana | Olimpija Ljubljana |
| Olin Wilson | Olin Chaddock Wilson |
| Olinda | Olinda |
