| Otachon Latifi | Otakhon Latifi |
| Otaci | Otaci |
| otacksam | ungrateful |
| otacksamhet | ingratitude |
| otadlig | flawless |
| otalig | incalculable |
| otaliga | numerous |
| Otanes | Otanes |
| Otecknad | Live action |
| Otello | Otello |
| Otello ossia Il moro di Venezia | Otello |
| Otep | OTEP |
| Otepää | Otepää |
| Othello | Othello |
| Other Voices | Other Voices |
| Othmarsingen | Othmarsingen |
| Othniel Charles Marsh | Othniel Charles Marsh |
| Otho | Otho |
| otillbörlig | unseemly |
| otillbörligt | unduly |
| otillfredsställande | unsatisfactory |
| otillförlitlighet | unreliability |
| otillgänglig | remote |
| otillgänglighet | inaccessibility |
| otillräcklig | deficient |
| otillräcklighet | inadequacy |
| otillräknelig | non compos mentis |
| otillständig | unseemly |
| otillständighet | indecorum |
| otillåten | illicit |
| otillåtlig | inadmissible |
| Otis Redding | Otis Redding |
| otit | otitis |
| Otjamtjira | Ochamchira |
| otjänlig | inexpedient |
| otjänst | damage |
| Otnäs | Otaniemi |
| Otohime | Toyotama-hime |
| Otokar Březina | Otokar Březina |
| Otomo no Yakamochi | Ōtomo no Yakamochi |
| Otrantosundet | Strait of Otranto |
| otrevlig | antipathetic |
| otrevlig händelse | unpleasant event |
| otrevligt | unpleasantly |
| otrivsam | uncomfortable |
| otro | unbelief |
| otrogen | disloyal |
| otrohet | disloyalty |
| otrolig | farfetched |
| otroliga | unbelievable |
| otrolighet | improbability |
| otroligt | amazingly |
| OTRS | OTRS |
| otrygg | precarious |
| otröstlig | desolate |
| otta | cockcrow |
| Ottaviano Mascherino | Ottaviano Nonni |
| Ottawa | Ottawa |
| Ottawa County | Ottawa County |
| Ottawa Senators | Ottawa Senators |
| Ottawafloden | Ottawa River |
| Ottawafördraget | Ottawa Treaty |
| ottefågel | early bird |
| Otterup kommun | Otterup municipality |
| ottesång | matins |
| Otto | Otto |
| Otto av Österrike | Archduke Otto Franz of Austria |
| Otto Baric | Otto Barić |
| Otto Bauer | Otto Bauer |
| Otto Binswanger | Otto Binswanger |
| Otto den rike | Otto |
| Otto Diels | Otto Diels |
| Otto Dix | Otto Dix |
| Otto Frank | Otto Frank |
| Otto Grimlund | Otto Grimlund |
| Otto Hahn | Otto Hahn |
| Otto Hölder | Otto Hölder |
| Otto I | Otto I |
| Otto I av Bayern | Otto of Bavaria |
| Otto I av Grekland | Otto of Greece |
| Otto Klemperer | Otto Klemperer |
| Otto Kuntze | Otto Kuntze |
| Otto Lilienthal | Otto Lilienthal |
| Otto Mann | Otto Mann |
| Otto Meyerhof | Otto Fritz Meyerhof |
| Otto Mueller | Otto Mueller |
| Otto Nerz | Otto Nerz |
| Otto Nordenskjöld | Otto Nordenskiöld |
| Otto Preminger | Otto Preminger |
| Otto Rehhagel | Otto Rehhagel |
| Otto Robert Frisch | Otto Robert Frisch |
| Otto Schott | Otto Schott |
| Otto Skorzeny | Otto Skorzeny |
| Otto Stern | Otto Stern |
| Otto Vellingk | Otto Vellingk |
| Otto Ville Kuusinen | Otto Ville Kuusinen |
| Otto von Bismarck | Otto von Bismarck |
| Otto von Böhtlingk | Otto von Bohtlingk |
| Otto von Guericke | Otto von Guericke |
| Otto von Habsburg | Otto von Habsburg |
| Otto Wagner | Otto Wagner |
| Otto Wallach | Otto Wallach |
| Otto Warburg | Otto Heinrich Warburg |
| Otto Weininger | Otto Weininger |
| Otto Wilhelm Hermann von Abich | Otto Wilhelm Hermann von Abich |
| Otto Wilhelm Königsmarck | Otto Wilhelm Königsmarck |
| Otto Wilhelm von Struve | Otto Wilhelm von Struve |
| Otto-von-Guericke-universitetet | Otto von Guericke University of Magdeburg |
| Ottokar I av Böhmen | Ottokar I of Bohemia |
| Ottokar III | Ottokar III of Styria |
| ottoman | ottoman |
| Ottomotor | Spark-ignition |
| Ottorino Respighi | Ottorino Respighi |
| otukt | fornication |
| otuktig | indecent |
| otur | misfortune |
| oturlig | luckless |
| oturliga | unlucky |
| otursförföljd | accident-prone |
| otvetydig | clear |
| otvivelaktig | absolute |
| otvivelaktigt | certainly |
