Siw Anita Andersen (born 27 April 1966) is a Norwegian actress and comedian, from Oslo.
She is probably best known to Norwegian viewers through her role as "Målfrid" in the TV sitcom "Mot i brøstet".
In addition to this she has also acted in other TV-shows such as "Nissene på låven" (2001), as well as movie roles.
She had her big screen debut in 1989 with the movie Showbiz, and later also had a role in The Polar Bear King (1991).
Andersen has also done stand-up and variety shows, and in 2002 won the Leif Juster honorary award, named after legendary Norwegian comedian Leif Juster.