| otherworldly | wereldvreemd |
| Othmarsingen | Othmarsingen |
| Othniel Ben Kenaz | Otniël |
| Othniel Charles Marsh | Othniel Charles Marsh |
| Otho | Otho |
| Otis Redding | Otis Redding |
| Otl Aicher | Otl Aicher |
| Otmar Hasler | Otmar Hasler |
| Otmuchów | Otmuchów |
| Oto | Oto |
| Otoacoustic emission | Oto-akoestische emissie |
| Otoe tribe | Oto |
| Otok | The Island |
| Otolith | Otolith |
| Otomat | Otomat |
| Otomi | Otomí |
| Otomi people | Otomí |
| Otomys | Otomys |
| Otranto | Otranto |
| OTRS | OTRS |
| Otsego County | Otsego County |
| Ottakring | Ottakring |
| Ottaviano Petrucci | Ottaviano Petrucci |
| Ottavio Bottecchia | Ottavio Bottecchia |
| Ottawa | Ottawa |
| Ottawa County | Ottawa County |
| Ottawa Lynx | Ottawa Lynx |
| Ottawa River | Ottawa |
| Ottawa Senators | Ottawa Senators |
| Ottawa Treaty | Ottawa Conventie |
| Ottendorf-Okrilla | Ottendorf-Okrilla |
| Ottenhofen | Ottenhofen |
| Ottenhöfen | Ottenhöfen im Schwarzwald |
| Ottensoos | Ottensoos |
| Ottenstein | Ottenstein |
| Ottenthal | Ottenthal |
| otter | otter |
| Otter Civet | Ottercivetkat |
| Otterberg | Otterberg |
| Otterfing | Otterfing |
| Otterndorf | Otterndorf |
| Ottersberg | Ottersberg |
| Otterstadt | Otterstadt |
| Ottersweier | Ottersweier |
| Otterthal | Otterthal |
| Otterup municipality | Otterup |
| Otting | Otting |
| Otto | Otto |
| Otto cycle | Ottomotor |
| Otto Diels | Otto Diels |
| Otto Dix | Otto Dix |
| Otto Frank | Otto Frank |
| Otto Fritz Meyerhof | Otto Fritz Meyerhof |
| Otto Hahn | Otto Hahn |
| Otto Heinrich Warburg | Otto Heinrich Warburg |
| Otto I | Otto I van Griekenland |
| Otto I of Guelders | Otto I van Gelre |
| Otto I of Nassau | Otto I van Nassau |
| Otto II of Lippe | Otto II van Lippe |
| Otto III of Montferrat | Otto III van Monferrato |
| Otto Jespersen | Otto Jespersen |
| Otto Klemperer | Otto Klemperer |
| Otto Liebmann | Otto Liebmann |
| Otto Lilienthal | Otto Lilienthal |
| Otto Mann | Otto Mann |
| Otto Mueller | Otto Müller |
| Otto of Bavaria | Otto I van Beieren |
| Otto of Greece | Otto I van Griekenland |
| Otto of Nordheim | Otto II van Northeim |
| Otto of Savoy | Otto van Savoye |
| Otto Preminger | Otto Preminger |
| Otto Pérez Molina | Otto Pérez |
| Otto Rehhagel | Otto Rehhagel |
| Otto Robert Frisch | Otto Frisch |
| Otto Schaden | Otto Schaden |
| Otto Schmidt | Otto Schmidt |
| Otto Skorzeny | Otto Skorzeny |
| Otto Stern | Otto Stern |
| Otto Ville Kuusinen | Otto Kuusinen |
| Otto von Bismarck | Otto von Bismarck |
| Otto von Guericke | Otto von Guericke |
| Otto von Habsburg | Otto von Habsburg |
| Otto von Kotzebue | Otto von Kotzebue |
| Otto Wagner | Otto Wagner |
| Otto Wallach | Otto Wallach |
| Otto Witte | Otto Witte |
| Ottobeuren | Ottobeuren |
| Ottobrunn | Ottobrunn |
| Ottokar I of Bohemia | Ottokar I van Bohemen |
