County Road 51 is a 168.2-kilometer-long (104.5 mi) highway which runs north–south between Vågå and Gol, Norway. Part of the road runs concurrently with E16, between Leira and Fagernes. The 37-kilometer (23 mi) section across Valdresflye is designated a National Tourist Route. This section is closed in the winter. Prior to 2010, the road was known as National Road 51.