County Road 51 (Norwegian: Fylkesvei 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.

[1][2] This section is closed in the winter.

Prior to 2010, the road was known as National Road 51 (Norwegian: Riksvei 51).