Cities in Russian Federation ( 3,759 )
- Oparino
- Opochka
- Oranzherei
- Orda, Perm Krai
- Ordynskoye
- Ordzhonikidzevskaya
- Ordzhonikidzevskiy, Karachay-Cherkessia
- Orekhovo-Zuyevo
- Orël-Izumrud
- Orenburg
- Orgtrud
- Orichi
- Orlov, Kirov Oblast
- Orlovka
- Orlovo
- Orlovskiy, Rostov Oblast
- Orotukan
- Orshanka, Mari El Republic
- Orsk
- Oryol
- Osa
- Osa, Perm Krai
- Osinki, Samara Oblast
- Osinniki
- Osinovo
- Ostashkov
- Ostrogozhsk
- Ostrov, Pskov Oblast
- Ostrovnoy
- Ostrovskoye, Kostroma Oblast
- Ostrovtsy
- Otkaznoye
- Otradnaya, Krasnodar Krai
- Otradnoye, Leningrad Oblast
- Otradnyy
- Otrado-Kubanskoye