Ostoja

Ostoja (Остоја) may refer to:


 * Ostoja, Łódź Voivodeship, a village in Poland
 * Ostoja, West Pomeranian Voivodeship, a village in Poland
 * Clan of Ostoja, a late medieval European clan
 * Ostoja coat of arms
 * Ostoja, masculine given name
 * Ostoja Rajaković, Serbian medieval nobleman
 * Ostoja Stjepanović, Macedonian footballer
 * Stephen Ostoja of Bosnia, Bosnian king