Surname Ostrovskaja (Островская 
, Ostrovskaja 
) , across the world, is a common family name. The surname Ostrovskaja is habitual in Belarus, where it is quite a common surname, Russia, where it is quite a rare surname, and Kazakhstan.
| VARIANT | COUNTRY |
|---|---|
| Островская | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |
| Ostrovskaja | Lithuania, Belarus, Estonia, Germany, Finland |