| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
3501  | Ozero Padmozero Ozero Padmozero,Patmajaervi,Patmajärvi,Patojarvi,Patojärvi,Озеро Падмозеро | Russia, Karelia | lake | N 62° 30′ 0'' | E 35° 10′ 0'' |
3502  | Ozinki Osinki,Ozinkhi,Ozinki,Starye Ozinki,Staryye Ozinki,Озинки,Старые Озинки | Russia, Saratov Oblast | populated place population 9,733 | N 51° 10′ 42'' | E 49° 40′ 36'' |
| 3503 | Ozherel'ye  Ozherel'e,Ozherel'ye,Ozherel’ye,Ozjerelje,Ожерелье | Russia, Moscow Oblast | populated place population 10,618 | N 54° 47′ 31'' | E 38° 15′ 56'' |
3504  | Ozyory Urban Okrug Gorodskoj okrug Ozery,Gorodskoj okrug Ozjory,Ozerskiy Rayon,Ozjorskij Rajon,Ozërskiy Rayon,Городской... | Russia, Moscow Oblast Ozyory Urban Okrug | second-order administrative division | N 54° 50′ 0'' | E 38° 35′ 0'' |
| 3505 | Ozërskiy Gorodskoy Okrug Ozerskij Rajon,Ozerskiy Gorodskoy Okrug,Ozerskiy Rayon,Oziorsko rajonas,Ozjorskij Gorodskoj Okrug,Oz... | Russia, Kaliningrad Oblast Ozërskiy Gorodskoy Okrug | second-order administrative division | N 54° 25′ 0'' | E 22° 0′ 0'' |
3506  | Urochishche Ozornikovo Ozarnikovo,Ozernikovo,Urochishche Ozornikovo,Urochishhe Ozornikovo,Урочище Озорниково | Russia, Kostroma Oblast | area | N 58° 52′ 15'' | E 42° 50′ 19'' |
| 3507 | Ozero Otradnoye Ozero Otradnoe,Ozero Otradnoye,Ozero Pykhyayarvi,Pyhaejaervi,Pyhäjärvi,Озеро Отрадное | Russia, Leningradskaya Oblast' | lake | N 60° 47′ 33'' | E 30° 17′ 23'' |
| 3508 | Otradnoye Otradnoe,Otradnoje,Otradnoye,Pella,Отрадное | Russia, Leningradskaya Oblast' | populated place population 21,397 | N 59° 46′ 39'' | E 30° 49′ 5'' |
| 3509 | Otradnensky District Otradnenskij Rajon,Otradnenskiy Rayon,Otradnensky,Otradnensky District,Отрадненский Район | Russia, Krasnodar Krai Otradnensky District | second-order administrative division population 64,001 | N 44° 19′ 58'' | E 41° 23′ 15'' |
| 3510 | Otradnaya Otradnaja,Otradnaya,Отрадная | Russia, Krasnodar Krai | seat of a second-order administrative division population 22,985 | N 44° 23′ 35'' | E 41° 31′ 9'' |
| 3511 | Ozero Otno Ozero Otle,Ozero Otna,Ozero Otno,Озеро Отно | Russia, Vologda Oblast | lake | N 59° 9′ 47'' | E 36° 27′ 1'' |
| 3512 | Ostrovsky District Ostrovskij Rajon,Ostrovskiy Rayon,Ostrovsky District,Semenovskij Rajon,Semenovskiy Rayon,Semënovskiy... | Russia, Kostroma Oblast Ostrovsky District | second-order administrative division | N 57° 50′ 5'' | E 42° 20′ 34'' |
| 3513 | Ostrovsky District Ostrovskij Rajon,Ostrovskiy Rayon,Ostrovsky District,Островский Район | Russia, Pskov Oblast Ostrovsky District | second-order administrative division population 28,844 | N 57° 15′ 0'' | E 28° 20′ 0'' |
| 3514 | Ozero Ostrovenskoye Ozero Ostrovenskoe,Ozero Ostrovenskoye,Ozero Ostrovno,Озеро Островенское,Озеро Островно | Russia, Novgorod Oblast | lake | N 58° 19′ 52'' | E 35° 0′ 34'' |
| 3515 | Ostrovka Ostrovka,Urochishche Ostrovka,Urochishhe Ostrovka,Урочище Островка | Russia, Orenburg Oblast | area | N 53° 18′ 0'' | E 54° 15′ 0'' |
| 3516 | Urochishche Ostrov Ostrov,Urochishche Ostrov,Urochishhe Ostrov,Остров,Урочище Остров | Russia, Vologda Oblast | area | N 58° 57′ 20'' | E 35° 28′ 46'' |
| 3517 | Ostrov Ostrau,Ostrov,Ostrova,Ostrovia,Ostrow,ao si te luo fu,awstrwf,awstrwf awblast pskwf,oseuteulopeu,os... | Russia, Pskov Oblast | seat of a second-order administrative division population 24,500 | N 57° 20′ 37'' | E 28° 21′ 13'' |
| 3518 | Ostrogozhsky District Ostrogozhskij Rajon,Ostrogozhskiy Rayon,Ostrogozhsky District,Острогожский Район | Russia, Voronezh Oblast Ostrogozhsky District | second-order administrative division population 58,309 | N 50° 54′ 43'' | E 39° 3′ 9'' |
| 3519 | Ostashkovsky District Ostashkovskij Rajon,Ostashkovskiy Rayon,Ostashkovsky District,Осташковский Район | Russia, Tver Oblast Ostashkovsky District | second-order administrative division | N 57° 10′ 0'' | E 33° 15′ 0'' |
| 3520 | Urochishche Ostashkino Ostashkin,Razvaliny Ostashkino,Urochishche Ostashkino,Urochishhe Ostashkino,Урочище Осташкино | Russia, Rostov | area | N 48° 31′ 25'' | E 40° 53′ 53'' |
| 3521 | Ostashëvo Ostaschowo,Ostashevo,Ostashjovo,Ostashovo,Ostashëvo,Ostasjevo,Осташево,Осташёво | Russia, Moscow Oblast Volokolamskiy Rayon | populated place population 2,743 | N 55° 51′ 38'' | E 35° 51′ 50'' |
| 3522 | Ostankinskiy Novoostankino,Ostankino,Ostankinskij,Ostankinskiy,Pushkinskoye,Останкинский | Russia, Moscow | section of populated place population 60,000 | N 55° 49′ 46'' | E 37° 36′ 57'' |
| 3523 | Orshanskiy Rayon Orshanskij Rajon,Orshanskiy Rayon,Оршанский Район | Russia, Mariy-El Republic Orshanskiy Rayon | second-order administrative division | N 56° 53′ 11'' | E 48° 1′ 35'' |
| 3524 | Orlovskiy Orlovka,Orlovskaya,Orlovskij,Orlovskiy,Орловский | Russia, Rostov | seat of a second-order administrative division population 19,325 | N 46° 52′ 27'' | E 42° 3′ 8'' |
| 3525 | Urochishche Orlovskiy Orlovka,Urochishche Orlovskiy,Urochishhe Orlovskij,Орловка,Урочище Орловский | Russia, Voronezh Oblast | area | N 51° 30′ 8'' | E 40° 43′ 38'' |
| 3526 | Ozero Oriyarvi Orijaervi,Orijärvi,Ozero Orijarvi,Ozero Oriyar,Ozero Oriyarvi,Озеро Ориярви | Russia, Murmansk | lake | N 66° 46′ 37'' | E 30° 53′ 14'' |
| 3527 | Urochishche Oritsel’kya Oricel'kja,Oriselkae,Oriselkä,Oritsel'kya,Oritsel’kya,Urochishche Oritsel'kya,Urochishche Oritsel’ky... | Russia, Karelia | area | N 61° 20′ 22'' | E 31° 37′ 6'' |
| 3528 | Orichevsky District Orichevskij Rajon,Orichevskiy Rayon,Orichevsky District,Оричевский Район | Russia, Kirov Oblast Orichevsky District | second-order administrative division population 29,289 | N 58° 19′ 44'' | E 48° 59′ 38'' |
| 3529 | Urochishche Orël Krasny Orel,Krasnyy Orel,Orel,Orël,Urochishche Orel,Urochishche Orël,Urochishhe Orjol,Урочище Орёл | Russia, Yaroslavl Oblast | area | N 58° 10′ 14'' | E 37° 35′ 13'' |
| 3530 | Orekhovo-Zuyevskiy Gorodskoy Okrug Orekhovo-Zuevskij Gorodskoj Okrug,Orekhovo-Zuevskij Rajon,Orekhovo-Zuyevskiy Gorodskoy Okrug,Orekhov... | Russia, Moscow Oblast Orekhovo-Zuyevskiy Gorodskoy Okrug | second-order administrative division | N 55° 41′ 16'' | E 39° 2′ 26'' |
| 3531 | Yandi Jandi,Jandin-KIotar,Jandy,Nu'ttakh-KIotar,Nuttax-Khotar,Nüttax-Khotar,Orekhovo,Orekhovsk,Orexovo,Ore... | Russia, Chechnya | populated place | N 43° 7′ 45'' | E 45° 19′ 46'' |
| 3532 | Ozero Ordovo Ozero Ordovo,Vozera Ardova,Vozyera Ardova,Возера Ардова,Озеро Ордово | Russia, Pskov Oblast | lake | N 55° 51′ 27'' | E 29° 52′ 0'' |
| 3533 | Oranzherei Oranjereinyi Promysel,Oranzherei,Oranzherey,Oranzhereynoye,Oranzjerei,Оранжереи | Russia, Astrakhan Oblast | populated place population 4,367 | N 45° 50′ 51'' | E 47° 33′ 58'' |
| 3534 | Opochka Opochka,Opotschka,Opotsjka,Pechka,Опочка | Russia, Pskov Oblast | seat of a second-order administrative division population 13,548 | N 56° 42′ 52'' | E 28° 39′ 46'' |
| 3535 | Opochetsky District Opochetskij Rajon,Opochetskiy Rayon,Opochetsky District,Опочетский Район | Russia, Pskov Oblast Opochetsky District | second-order administrative division | N 56° 40′ 0'' | E 28° 50′ 0'' |
| 3536 | Oparinsky District Oparinskij Rajon,Oparinskiy Rayon,Oparinsky District,Опаринский Район | Russia, Kirov Oblast Oparinsky District | second-order administrative division population 9,440 | N 59° 39′ 58'' | E 47° 49′ 48'' |
| 3537 | Ozero Ontulya-Kangas Ontulan-Kangasjarvi,Ozero Ontulja-Kangas,Ozero Ontulya Khangas,Ozero Ontulya-Kangas,Озеро Онтуля-Кан... | Russia, Murmansk | lake | N 66° 36′ 56'' | E 31° 45′ 54'' |
| 3538 | Onezhsky District Onezhskij Rajon,Onezhskiy Rayon,Onezhsky District,Онежский Район | Russia, Arkhangelskaya Onezhsky District | second-order administrative division | N 63° 20′ 0'' | E 38° 0′ 0'' |
| 3539 | Onezhskiy Bereg Bereg Lyamitskiy,Lyamitski Coast,Lyamitskiy Bereg,Lyamtzi Coast,Onezhskij Bereg,Onezhskiy Bereg,Onye... | Russia, Arkhangelskaya | coast | N 64° 40′ 0'' | E 36° 50′ 0'' |
| 3540 | Onega AEaeninen,Onega,Ääninen,Онега | Russia, Arkhangelskaya | populated place population 22,693 | N 63° 54′ 20'' | E 38° 5′ 58'' |
| 3541 | Omutninsky District Omutninskij Rajon,Omutninskiy Rayon,Omutninsky,Omutninsky District,Омутнинский Район | Russia, Kirov Oblast Omutninsky District | second-order administrative division population 40,242 | N 58° 50′ 0'' | E 52° 20′ 0'' |
| 3542 | Ozero Ol’shanskoye Ozero Ol'shanskoe,Ozero Ol'shanskoye,Ozero Ol’shanskoye,Ozero Pakha-Yarvi,Pahajaervi,Pahajärvi,Озеро... | Russia, Leningradskaya Oblast' | lake | N 60° 23′ 8'' | E 29° 48′ 1'' |
| 3543 | Olonetskiy Rayon Aunuksen piiri,Olonetskij Rajon,Olonetskiy Rayon,Олонетский Район | Russia, Karelia Olonetskiy Rayon | second-order administrative division | N 61° 6′ 3'' | E 32° 49′ 49'' |
| 3544 | Olkhovsky District Ol'khovskij Rajon,Ol'khovskiy Rayon,Olkhovsky District,Ol’khovskiy Rayon,Ольховский Район | Russia, Volgograd Oblast Olkhovsky District | second-order administrative division | N 49° 49′ 24'' | E 44° 32′ 41'' |
| 3545 | Ol'khovka Ol'khovka,Olkhovka,Ol’khovka,Urochishche Ol'khovka,Urochishche Ol’khovka,Urochishhe Ol'khovka,Ольхов... | Russia, Arkhangelskaya | area | N 60° 57′ 31'' | E 48° 8′ 19'' |
| 3546 | Olkhovatsky District Ol'khovatskij Rajon,Ol'khovatskiy Rayon,Olkhovatsky District,Ol’khovatskiy Rayon,Ольховатский Район | Russia, Voronezh Oblast Olkhovatsky District | second-order administrative division | N 50° 19′ 43'' | E 39° 14′ 31'' |
| 3547 | Ol’gino Ol'gino,Ol'inno,Olgino,Ol’gino,Ol’inno,Ольгино,Օլգինո | Russia, Nizhny Novgorod Oblast Nizhny Novgorod Urban Okrug | populated place | N 56° 13′ 10'' | E 43° 55′ 59'' |
| 3548 | Ozero Olenino Ozero Khassin-Lampi,Ozero Olenino,Suuri Hassinlampi,Озеро Оленино | Russia, Leningradskaya Oblast' | lake | N 60° 49′ 50'' | E 30° 0′ 44'' |
| 3549 | Okulovsky District Okulovskij Rajon,Okulovskiy Rayon,Okulovsky District,Окуловский Район | Russia, Novgorod Oblast Okulovsky District | second-order administrative division population 21,401 | N 58° 27′ 50'' | E 33° 10′ 35'' |
| 3550 | Okulovka Akulauka,Okoelovka,Okoulovka,Okulovka,Okulowka,Okułowka,Okúlovka,ao ku luo fu ka,awkwlwfka,awkylwfka... | Russia, Novgorod Oblast | seat of a second-order administrative division population 13,852 | N 58° 24′ 28'' | E 33° 17′ 18'' |
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