Route 1 or the Ring Road (Icelandic: Þjóðvegur 1, Hringvegur) is a main road in Iceland that runs around the island and connects the different parts of the country together. The total length of the road is 1339 km.

For almost all its length, the road is two lanes wide with one lane in each direction except when it passes through larger towns and cities where it may be expanded to more lanes as well as in the Hvalfjörður Tunnel. The road is paved with asphalt for most of its length but there are still stretches of it in the east part of the country that are unpaved and with gravel surface.

The amount of traffic on the road varies a lot depending on location, in and near Reykjavík it is around 5000-10000 vehicles per day but the stretches furthest away from larger towns see less then 100 vehicles per day on average.

The circle was finished in 1974 when the bridge over Skeiðará river in Southern Iceland was opened.

The road has been popular with tourists for decades since it covers a lot of the country and many interesting sights are not far from it. It has been an especially popular tour with Icelandic families on summer vacation, but in later years the route is becoming more popular with foreigners who like to either rent a car or bring their own on the ferry to Seyðisfjörður .