Almannaskarðsgöng is a tunnel along Route 1, located near Höfn (Hornafjörður) in Austurland in eastern Iceland. The tunnel measures 1312 metres exactly in length and was opened on June 24, 2005. The tunnel passes through narrow and steep pass between Hornafjörður and Lón district.
During the winter the road had to be closed because of regular snow, blocking traffic to and from the east of Iceland, so a new tunnel began construction in March 2004 and was completed in October 2004. The tunnel runs through 1150 metres of solid rock and some 162 metres of concrete portals, bringing the total length to 1312 metres. The road is two lanes wide, although there are three passing places in the tunnel for emergency traffic. The southern tunnel entrance is located at 39 metres above sea level whilst the northern tunnel entrance is located at 82 metres to the north, making the incline of the tunnel 4.6%.