National Highway 505, commonly called NH 505, is a national highway in India. It is a spur road of National Highway 5. NH-505 traverses the state of Himachal Pradesh in India. NH505 a high altitude road, covers Kinnaur and Lahaul and Spiti districts of Himachal Pradesh, mainly running along Spiti river in Spiti valley. The highway from Kaza to Gramphu remains closed for 6-9 months in a year due to heavy snowfall and closure of Kunzum La pass at an altitude of .