The North Sea Cup was an open chess tournament played in Esbjerg, Denmark from 1976 to 2008. Until 2003 there was an amateur section (a Swiss system tournament) and a 10-player round-robin tournament for titled players. The exceptions are 1986 and 1987. In 1986 the titled section was the play-off for the Danish Chess Championship. In 1987 the titled section was replaced by the Danish Juniors' Championship. From 2004 the tournament has only one division, a nine- or ten-round Swiss system.
The North Sea Cup was not played in 2009.