Sixten Lundberg, born March 18, 1961, in Helsinki, is a Finnish actor. Lundberg studied at the Theater Academy 1979-83. Over time, he has developed into a skilled comedian who draws audiences and laughs where he shows up. In 2003-05, he broke a personal record as Grottmannen on the Swedish Theatre's mini-stage, with an outspoken gender role parody that attracted over 7,000 spectators. In parallel, he also played assertive neighbor (2004-05) in Middagsgästen - Illallisvieras at Lilla teatern.

Already as a student, he participated in plays at the Swedish Theater, and later, among other things, in Gunilla Hemming's "En tyst bolagsman" and in the popular adaptation of "Emil i Lönneberga" directed by Sven Sid 1985-86. He has for long periods worked as a freelancer, created his own entertainment programs and done various theatre roles; for example Herra Huu at the Helsinki City Theater in 2002.