Cities in Russian Federation ( 3,759 )
- Obsharovka
- Obukhovo
- Ocher
- Odesskoye
- Odintsovo
- Odoyev
- Okha
- Okhansk
- Okhotsk
- Okoneshnikovo
- Oktyabr’skiy
- Oktyabrsky, Moscow Oblast
- Oktyabrsky, Republic of Bashkortostan
- Oktyabrsky, Ryazan
- Okulovka
- Ola
- Olenegorsk, Murmansk Oblast
- Olenino
- Ol'ga
- Ol’gino
- Olginskaya
- Ol'ginskaya
- Ol'khovatka
- Olonets
- Olovyannaya
- Olym
- Olyokminsk
- Omsk
- Omsukchan
- Omutinskiy
- Omutninsk
- Onega
- Onguday
- Onokhino
- Onokhoy
- Opalikha