Roskildevej is a road between Copenhagen and Roskilde in the Danish capital area. The direct continuation of Vesterbrogade, which begins at Copenhagen's City Hall Square, the road begins at Pile Allé and continues through Frederiksberg, Valby, Rødovre, Glostrup, Albertslund, Taastrup and Hedehusene to Roskilde. The section between Hedehusene and Roskilde is now known as Københavnsvej and in Hedehusene and Glostrup it is simply known as Hovedgaden ("Main Street").
The section from Aalholm Plads in Copenhagen to The Eastern Ring Road in Roskilde (part of Primary Route 6) is known as Secondary Route 156 and is 24 km long. The total distance from Copenhagen City Hall Square to Algade in Roskilde is about 31 km.