Tauno Olavi Marttinen (27 September 1912 – 18 July 2008) was a Finnish composer of contemporary classical music.
Born in Helsinki, Marttinen studied in Viipuri and Helsinki. His earliest works are mainly late romantic. His output includes ten symphonies, concertos for various instruments, operas, chamber music, and ballets, among others. In 1965, Marttinen was awarded a Pro Finlandia medal.
Marttinen was named a professor by the president Urho Kekkonen in 1972. A long-time resident of Hämeenlinna, the composer spent his last years in Turenki.
The only international foundation "Tauno Marttisen Kunniaksi" (Foundation in honouring Tauno Marttinen) is located in The Netherlands, with Leeuwarden as residence.