Sidsel Ryen (born 29. april 1943) Norwegian actor, singer and musical artist. She is specially known as Leonora Dorothea Dahl in the Norwegian version of Sesame Street "Sesam Stasjon".

Sidsel has played Maria in West Side Story, Hanna Glawari in Den glade enke and Eliza Doolittle in My Fair Lady . Flaggermusen (Adele), Kaptein Sabeltann Og Jakten På Den Magiske Diamant, Kiss Me Kate, Anything Goes, Crazy For You, Juleoratoriet, Cabaret, My Fair Lady, La Cage aux Folles, Victoria, Olsenbanden jr. på cirkus, Manndomsprøven, Nøtteknekkeren, Besøk hos familien Hansen halv syv og Les Misérables.