MS Birgo was a Norwegian cargo ship that was built in 1967. The ship sank 18 July 1978 in Nedstrandfjorden. While the initial investigation was inconclusive, the loss was later determined to be a deliberate scuttling by the ship's owner as an insurance fraud scheme. The litigation by the insurance company in the aftermath of the investigation reached the Supreme Court where the principle of condictio indebiti was tested.