| Oetophorus cornutus | Oetophorus koreensis | Oetophorus maculatus |
| Oetophorus naevius | Oetophorus obscurus | Oetophorus pleuralis |
| Oetophorus taiwanensis | Oetosis angustifolia | Oetosis blechnodes |
| Oetosis carnosa | Oetosis elongata | Oetosis ensiformis |
| Oetosis filiformis | Oetosis furcata | Oetosis isoetifolia |
| Oetosis lineata | Oetosis obtusa | Oetosis ophioglossodes |
| Oetosis rigida | Oetosis stipitata | Oetosis zosterifolia |
| Oettern | Oettersdorf | Oevenum |
| Oeversee | Oeyregave | Oeyreluy |
| Oezdemirus alternans | Oezdemirus teres | Of |
| Of June | Of June (EP) | Of June EP |
| Of Monsters and Men | Of the Night (bài hát) | Of, Trabzon |
| Ofaiston | Ofaiston monandrum | Ofakim |
| Ofatulena | OFB | OFC |
| OFC Champions League | OFC Nations Cup | OFC Nations Cup 2008 |
| OFC Nations Cup 2012 | OFDM | Ofena |
| Off the wall | Off the Wall | Off the Wall (album) |
| Off the Wall (bài hát) | Offa của Mercia | Offagna |
| Offanengo | Offekerque | Offemont |
| Offenau | Offenbach (huyện) | Offenbach am Main |
| Offenbach an der Queich | Offenbach-Hundheim | Offenbüttel |
| Offenberg | Offendorf | Offenhausen |
| Offenheim | Offerle, Kansas | Office 16 |
| Office 2016 | Office Open XML | Officers |
| Official Charts Company | Offida | Offignies |
| Offin | Offingen | Offlaga |
| Offlanges | Offline | Offoy, Oise |
| Offoy, Somme | Offranville | Offrethun |
| Offroicourt | Offshore leaks | Offshoring |
| Offstein | Offwiller | Oficanthon |
| Oficanthon mirabilis | Ofis, Kızıltepe | Ofköy, Bismil |
| Ofterdingen | Oftering | Ofterschwang |
| Oftia africana | Oftia revoluta | Oftringen |
| Ofu-Olosega | Ofusato | Oga, Akita |
| Ogallah, Quận Trego, Kansas | OGame | Ogan Ilir |
| Ogan Komering Ilir | Ogan Komering Ulu | Ogan Komering Ulu Selatan |
| Ogan Komering Ulu Timur | Oganesson | Ogasawara |
| Ogasawara Mitsuo | Ogastemma pusillum | Ogata Sadako |
| Ogawa Daiki | Ogawa Keijiro | Ogawa Kiyoshi |
| Ogawa Koki (cầu thủ bóng đá) | Ogawa Ryoya | Ogōri, Fukuoka |
| Ogéviller | Ogíjares | OGC |
| Ogcocephalidae | Ogcocephalus | Ogcocephalus corniger |
| Ogcocephalus darwini | Ogcocephalus radiatus | Ogcogaster (Ogcogaster) segmentator |
| Ogcogaster (Ogcogaster) tessellatus | Ogcogaster kempi | Ogcogaster kirbyi |
| Ogcogaster segmentator | Ogcogaster tessellata | Ogcogaster tessellatus |
| Ogden Nash | Ogden, Arkansas | Ogden, Illinois |
| Ogden, Iowa | Ogden, Kansas | Ogden, Quận Champaign, Illinois |
| Ogden, Quận Riley, Kansas | Ogdenia | Ogdenia mutilla |
| Ogdensburg, Wisconsin | Ogdoconta | Ogdoconta altura |
| Ogdoconta atomaria | Ogdoconta cinereola | Ogdoconta cymographa |
| Ogdoconta gamura | Ogdoconta justitia | Ogdoconta lilacina |
| Ogdoconta moreno | Ogdoconta musculus | Ogdoconta plumbea |
| Ogdoconta pulverulenta | Ogdoconta pulvilinea | Ogdoconta sexta |
| Ogdoconta tacna | Ogdoecosta | Ogdoecosta juvenca |
| Ogema, Minnesota | Ogema, Wisconsin | Ogenne-Camptort |
| Oger, Marne | Ogeu-les-Bains | Ogeum-dong |
| Oggaz | Oggebbio | Oggelshausen |
| Oggiona con Santo Stefano | Oggiono | Oggiyamduraipakkam |
| Oggy and the Cockroaches | Oggy et les Cafards | Oggy và những chú gián tinh nghịch |
| Oghuz (quận) | Ogi | Ogi Aritatsu |
| Ogi Kota | Ogi, Saga | Ogihara Takahiro |
| Ogilbia galapagosensis | Ogilbia pearsei | Ogilby's ghostshark |
| Ogilby's rainbowfish | Ogilvie, Minnesota | Ogilvy & Mather |
| Ogla Melha | Oglasa | Oglasa annulisigna |
| Oglasa ansorgei | Oglasa apicalis | Oglasa arcuata |
| Oglasa aroa | Oglasa atristipata | Oglasa aulota |
| Oglasa bifidalis | Oglasa bisignata | Oglasa calimanii |
| Oglasa captata | Oglasa chavenei | Oglasa clearchus |
| Oglasa closteroides | Oglasa collenettei | Oglasa confluens |
| Oglasa connectens | Oglasa consanguis | Oglasa contigua |
| Oglasa cornuta | Oglasa cosmiodes | Oglasa costimaculata |
| Oglasa costiplaga | Oglasa costisignata | Oglasa defixa |
| Oglasa dia | Oglasa diagonalis | Oglasa diasticta |
| Oglasa dufayi | Oglasa ecclipsis | Oglasa fulviceps |
| Oglasa fusciterminata | Oglasa griselda | Oglasa hollandi |
| Oglasa holophaea | Oglasa hypenoides | Oglasa iselaea |
| Oglasa junctisigna | Oglasa lagusalis | Oglasa lunifera |
| Oglasa maculata | Oglasa maculosa | Oglasa malagasy |
| Oglasa mediopallens | Oglasa microsema | Oglasa nana |
| Oglasa niloticus | Oglasa notabilis | Oglasa obliquilinea |
| Oglasa ochreobrunneata | Oglasa ochreovenata | Oglasa ozela |
| Oglasa pachycnemis | Oglasa parallela | Oglasa phaeonephele |
| Oglasa plagiata | Oglasa pomona | Oglasa prionosticha |
| Oglasa purpureotincta | Oglasa renilinea | Oglasa retracta |
| Oglasa rufimedia | Oglasa rufoaurantia | Oglasa sambawana |
| Oglasa separata | Oglasa sordida | Oglasa stygiana |
| Oglasa tamsi | Oglasa tessellata | Oglasa trigona |
| Oglasa umbrosa | Oglasa xanthorhabda | Oglasodes |
| Oglasodes atrisignata | Oglasodes bisinuata | Oglasodes nyasica |
| Ogle, Quận Somerset, Pennsylvania | OGLE-2005-BLG-169Lb | OGLE-2014-BLG-0124Lb |
| OGLE-2016-BLG-1195Lb | Oglesby, Illinois | Oglesby, Texas |
| Oglianico | Ogliastra | Ogliastra (tỉnh) |
| Ogliastro | Ogliastro Cilento | Ogloblinia |
| Ogloblinia keralaensis | Ogmodera albovittata | Ogmodera forticornis |
| Ogmodera kenyensis | Ogmodera lobata | Ogmodera multialboguttata |
| Ogmodera nigrociliata | Ogmodera sudanica | Ogmodera sulcata |
| Ogmoderidius aethiopicus | Ogmoderidius flavolineatus | Ogmoderidius gardneri |
| Ogmoderidius nebulosus | Ogmoderidius posthumeralis | Ogmodirus |
| Ogmodon vitianus | OGN | OGN (kênh TV) |
| Ognéville | Ognes, Aisne | Ognes, Marne |
