3JS is a Dutch band from Volendam, North Holland, which consists of Jan Dulles, Jaap Kwakman and Jaap de Witte. The band became nationally known after the success of their debut album, Watermensen in 2007 with their friends Jan Smit and Nick & Simon.
The name of the band is based on the first names of the three members; Jan Dulles, Jaap Kwakman and Jaap de Witte.
The three members have known each other since 1996. From 2002 they performed locally under their current name, 3JS.