奥利亚瓦河是欧洲中部的河流，流经克罗地亚波热加-斯拉沃尼亚县，属于萨瓦河的左支流，河道全长89公里，流域面积1,494平方公里，河道上有多处急流和瀑布。

Orljava is a river in Slavonia, eastern Croatia, a left tributary of Sava. It is 89 kilometres (55 mi) long and its basin covers an area of 1,494 square kilometres (577 sq mi).

Orljava rises in the mountainous forested areas of Psunj, south of Bučje. It receives influx from smaller rivers that rise in the mountains of Papuk and Požeška gora. Near Srednje Selo it starts turning southeast, and at Pleternica it merges with the river Londža that rises in Krndija. It then runs south to pass between Požeška gora and Dilj, when it turns to the southwest. As it flows south of Dragovci, the river turns south and eventually flows into the river Sava just west of Slavonski Kobaš, at 45°06′24″N 17°43′29″E / 45.106777°N 17.724656°E / 45.106777; 17.724656.