Norwegian National Road 4 (Norwegian: Riksvei 4, Rv4) is a national road in Norway which is the main route north from the capital city of Oslo to the junction with the European route E6 highway at the village of Biri in Gjøvik Municipality.

In 2021, the government began studying ways to improve the road to allieviate traffic problems.

The road continues northward through Nittedal municipality, including the villages of Rotnes, Hakadal, and Harestua.

From there, the road runs north to Einavoll and along the east side of the lake Einavatnet to the village of Eina.

There is a newly built portion of the highway that has a toll that runs from Reinsvoll centre, past Raufoss to the junction with County Road 33 in Hunndalen.