Lagmannsholmen was an island at the entrance to the western part of the harbor of Kristiansand in Agder county, Norway.

Between the years 1750–1758, construction was completed for a new headquarters and main station for the navy at Fredriksvern naval station and shipyard at Stavern in Vestfold.

Most of the former islet consists today of large warehouses and a concrete grain silo.

In May 2017 a new dock for cruise ships was put into operation at Lagmannsholmen.

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