is the administrative centre of the municipality of Bamble, Norway. The town of Langesund was established as a municipality 1 January 1838 (see formannskapsdistrikt). It was merged with Bamble 1 January 1964. In the early days, Langesund was one of the most important shipping towns in Norway.Peter Wessel Tordenskiold got one of his ships built in Langesund, . It was known as Longsound in English in the 1800s.