D38 is a state road in the Slavonia region of Croatia that connects the cities of Pakrac, Požega, Pleternica and Đakovo. The road is 120.7 km (75.0 mi) long.

D51 connects A3 motorway Nova Gradiška interchange to Nova Gradiška and Požega. The road forms two junctions to D38 state road, one in Brestovac, where D38 branches off to Pakrac, and another 5 km (3.1 mi) further east, in Požega, where D38 branches off to Pleternica. Between those two junctions D51 and D38 are concurrent. The eastern terminus of the road is near Gradište, at a junction to D53 state road to Našice and Slavonski Brod. The road is 50.3 km (31.3 mi) long.