Martti Wallén was a Finnish operatic bass singer. Born in Helsinki, he performed both internationally and in his native country where he was a visiting soloist at the Finnish National Opera for many years. He created the role of the Judge in the world premiere of Aulis Sallinen's The Horseman at the Savonlinna Opera Festival in 1975. He was a member of the Royal Swedish Opera from 1975 to 2000.