- Ob'
- Oblivskaya
- Obninsk
- Obolensk
- Oboyan'
- Obraztsovka
- Obruchevo
- Obsharovka
- Obukhovo
- Obukhovo
- Obukhovo
- Obukhovskoye
- Ochakovo-Matveyevskoye
- Ocher
- Odesskoye
- Odintsovo
- Odoyev
- Ogodzha
- Okha
- Okhansk
- Okhotsk
- Okino-Klyuchi
- Okoneshnikovo
- Oksovskiy
- Oktyabr'sk
- Oktyabr'skiy
- Oktyabr'skiy
- Oktyabr'skiy
- Oktyabr'skiy
- Oktyabr’skiy
- Oktyabr’skiy Vtoroy
- Oktyabrsky
- Okulovka
- Ol'ga
- Ol'ginka
- Ol'gino
- Ol’gino
- Ol'ginskaya
- Ol'govo
- Ol'khovatka
- Ol'yavidovo
- Ola
- Olenegorsk
- Olenino
- Olenye
- Olenyok
- Olginskaya
- Olonets
- Olovyannaya
- Olym
- Olyokminsk
- Omsk
- Omsukchan
- Omutinskiy
- Omutninsk
- Onega
- Onezh'ye
- Onguday
- Onokhino
- Onokhoy
- Opalëvo
- Opalikha
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- Opechenskiy Posad
- Opochka
- Oranzherei
- Orda
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- Orekhovo
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- Orekhovo-Zuyevo
- Orël-Izumrud
- Orenburg
- Orevo
- Orgtrud
- Orichi
- Orlik
- Orlov
- Orlovka
- Orlovo
- Orlovskiy
- Orlovskiy
- Orlyanka
- Orotukan
- Orsha
- Orshanka
- Orsk
- Orud'yevo
- Oryol
- Osa
- Osa
- Osel’ki
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- Osinki
- Osinniki
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- Ostashkov
- Ostashkovo
- Oster
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- Ostrov
- Ostrov
- Ostrov Kharlov
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- Otrada
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- Otradnoye
- Otradnoye
- Otradnoye
- Otradnoye
- Otradnyy
- Otrado-Kubanskoye
- Ous
- Ovcharnya
- Overyata
- Ovoshchi
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- Ovsyanka
- Ovsyanka
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- Oyëk
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- Ozërnyy
- Ozero-Krasilovo
- Ozero-Kureyevo
- Ozersk
- Ozërsk
- Ozherel'ye
- Ozinki
- Ozyory
