Limfjordstunnelen (The Limfjord Tunnel) is a Danish motorway tunnel which connects the highway in eastern Aalborg with the highway east of Nørresundby.
Comprising a segment of the North Jutland Motorway, it passes under the shallow sound of Limfjorden.
It is one of three permanent links between Vendsyssel and Himmerland, the other two being Limfjordsbroen in central Aalborg and Jernbanebroen over Limfjorden, the railway bridge, slightly west of the city center.
This problem was discovered a few years after opening and was caused by improper sealing.
In 1996–97, the tunnel was sporadically closed to traffic for rectification of the concrete and for reinforcement, which in turn was plagued by rust.