Illhøllia Tunnel (Norwegian: Illhøllia tunnel, sometimes spelled Ildhøllia) is a 1,262-metre (4,140 ft) long tunnel on European route E06 in the Dunderlandsdal valley in the municipality of Rana in Nordland county, Norway. The tunnel was opened in 2002. The tunnel is located in an area with very steep mountains along the Ranelva river.