O
- Oblivskaya
- Obninsk
- Oboyan'
- Obsharovka
- Ob'
- Ocher
- Odesskoye
- Odintsovo
- Odoyev
- Ogodzha
- Okha
- Okhansk
- Okhotsk
- Okoneshnikovo
- Oksovskiy
- Oktyabr'sk
- Oktyabr'skiy, Krasnoyarskiy Kray
- Oktyabr'skiy
- Oktyabrsky
- Okulovka
- Ol'ginka
- Ol'ginskaya, Krasnodarskiy Kray
- Ol'ginskaya
- Ol'khovatka
- Ola
- Olekminsk
- Olenegorsk
- Olenino
- Olonets
- Olovyannaya
- Olym
- Ol’gino
- Omsk
- Omsukchan
- Omutinskiy
- Omutninsk
- Onega
- Onguday
- Onokhino
- Onokhoy
- Opalikha
- Oparino
- Opechenskiy Posad
- Opochka
- Oranzherei
- Orda
- Ordynskoye
- Ordzhonikidzevskaya
- Ordzhonikidzevskiy
- Orekhovo-Zuyevo
- Orël
- Orel-Izumrud
- Orenburg
- Orgtrud
- Orichi
- Orlik
- Orlov
- Orlovka
- Orlovo
- Orlovskiy
- Orlovskiy, Aginskiy Buryatskiy Avtonomnyy Okrug
- Orotukan
- Orsha, Tverskaya Oblast’
- Orshanka
- Orsk
- Orud'yevo
- Osa, Permskaya Oblast�
- Osa
- Osinki
- Osinniki
- Osinovo
- Ossora
- Ostashkov
- Oster, Smolenskaya Oblast'
- Ostrogozhsk
- Ostrov, Pskovskaya Oblast'
- Ostrov Kharlov
- Ostrovnoy
- Ostrovskoye
- Ostrovtsy
- Otkaznoye
- Otrada
- Otradnaya
- Otradnoye
- Otradnoye, Leningrad
- Otradnyy
- Otrado-Kubanskoye
- Ous
- Overyata
- Ovsyanka
- Ovsyanka, Krasnoyarskiy Kray
- Oyëk
- Oymyakon
- Oyskhara
- Ozernovskiy
- Ozërsk, Chelyabinskaya Oblast'
- Ozërsk
- Ozëry
- Ozinki