Educated at the The Norwegian Academy of Dramatic Art, he made his debut as Jesus in "Godspell" at The National Theatre in Bergen. Wiik’s international breakthrough came with Jean Valjean in "Les Misérables" at The Norwegian Theatre in Oslo. British theatrical producer Sir Cameron Mackintosh hired Wiik to portray Jean Valjean, first at The Raimund Theater in Vienna and then in the original production at The Palace Theatre in London. Together with composer Gisle Kverndokk and dramaturg Inger Schjoldager, Øystein Wiik has written and produced several musicals, including "Sophie’s World", based on Jostein Gaarder’s world famous novel.