Klas "Klasse" Möllberg (born 21 April 1948) is a Swedish musician and actor.

Later he met the 12 years older musician Lasse Lundberg who influenced him to a music style which he would reflect in his works in the future.

He met "Trazan" (Lasse Åberg) for first time in Gothenburg where Möllberg was playing with a band.

Möllberg hosted the 1992 Sveriges Television's Christmas calendar, Klasses julkalender.

Jag är med i en japansk TV-show and finished in 2nd place.