M. Davidsen was the name of a passenger ship in Iceland that began operations in 1891. It had a gross tonnage of 217, was 35.25 m (115.6 ft) long, 6.21 m (20.4 ft) wide and 4.86 m (16.0 ft) deep. It had accommodation for 14 passengers. The ship was purchased by Denmark in 1919 for 225,000 Icelandic Krona and used to transport people and goods between Reykjavík and places in Faxa Bay and Breiðafjörður. After the purchase, it was renamed Suðurland in 1919.
Suðurland is now an abandoned ship's hulk near the abandoned herring factory in Djúpavík, Iceland. It was docked there in 1935 to serve as living quarters for the men working in the factory.