| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ostrov Belov | city | Pskovskaya Oblast' | Russia | 58.00 | 28.02 | 55 | 0 |
| Ostrov Bol'shaya Doroga | city | Kareliya | Russia | 61.82 | 36.87 | 187 | 149 |
| Ostrov Bolshevik Air Base | airport | 78.58 | 101.00 | 965 | 0 | ||
| Ostrov Bol’shaya Doroga | city | Kareliya | Russia | 61.82 | 36.87 | 187 | 149 |
| Ostrov Bratskaya Protoka | city | Irkutskaya Oblast' | Russia | 53.91 | 102.09 | 1669 | 2282 |
| Ostrov Chechen | city | Dagestan | Russia | 43.96 | 47.64 | -1689 | 10194 |
| Ostrov Chechen' | city | Dagestan | Russia | 43.96 | 47.64 | -1689 | 10194 |
| Ostrov Chechen’ | city | Dagestan | Russia | 43.96 | 47.64 | -1689 | 10194 |
| Ostrov Kharlov | city | Murmanskaya Oblast' | Russia | 68.81 | 37.33 | 209 | 37 |
| Ostrov Kolpina | city | Pskovskaya Oblast' | Russia | 58.04 | 27.62 | 141 | 280 |
| Ostrov Kolpina-Sare | city | Pskovskaya Oblast' | Russia | 58.04 | 27.62 | 141 | 280 |
| Ostrov Kolpino | city | Pskovskaya Oblast' | Russia | 58.04 | 27.62 | 141 | 280 |
| Ostrov Lisiy | city | Tverskaya Oblast' | Russia | 57.59 | 34.41 | 830 | 3254 |
| Ostrov Naval Air Base | airport | 57.30 | 28.43 | 220 | 0 | ||
| Ostrov Pervyy | city | Minskaya Oblast' | Belarus | 54.54 | 27.75 | 830 | 1341 |
| Ostrov Tsjetsjen | city | Dagestan | Russia | 43.96 | 47.64 | -1689 | 10194 |
| Ostrov Vozrozhdeniya Airport | airport | 45.16 | 59.30 | 232 | 0 | ||
| Ostrov Vozrozhdeniya Southwest Airport | airport | 45.09 | 59.22 | 194 | 0 | ||
| Ostrov Vtoroy | city | Minskaya Oblast' | Belarus | 54.53 | 27.75 | 830 | 1341 |
| Ostrov Yur'yev | city | Belarus | 54.72 | 30.67 | 830 | 1500 | |
| Ostrov Yur’yev | city | Belarus | 54.72 | 30.67 | 830 | 1500 | |
| Ostrov Zalit | city | Pskovskaya Oblast' | Russia | 58.01 | 28.07 | 82 | 32 |
| Ostrov Zalita | city | Pskovskaya Oblast' | Russia | 58.01 | 28.07 | 82 | 32 |
| Ostrov Zelenyy | city | Volgogradskaya Oblast' | Russia | 48.79 | 44.69 | 13 | 135937 |
| Ostrov Zhizhgin | city | Arkhangel'skaya Oblast' | Russia | 65.20 | 36.82 | 0 | 0 |
| Ostrov nad Ohří | city | Karlovarsky Kraj | Czech Republic | 50.31 | 12.95 | 1669 | 26691 |
| Ostrov nad Oslavou | city | Vysocina | Czech Republic | 49.49 | 15.99 | 1791 | 5606 |
| Ostrov u Bezdružic | city | Plzensky Kraj | Czech Republic | 49.90 | 13.04 | 1683 | 1221 |
| Ostrov u Macochy | city | Jihomoravsky Kraj | Czech Republic | 49.38 | 16.76 | 1745 | 14126 |
| Ostrov u Stříbra | city | Plzensky Kraj | Czech Republic | 49.70 | 13.04 | 1669 | 2128 |