D203 is a state road in Gorski Kotar region of Croatia connecting Brod na Kupi and nearby border crossing to Slovenia to D3 state road in Delnice, and the road also serves as a connecting road to the A6 motorway as it terminates near Delnice interchange. The road is 11.2 km (7.0 mi) long. The road, as well as all other state roads in Croatia, is managed and maintained by Hrvatske ceste, state owned company.