Detto Mariano (born 27 July 1937) is an Italian composer, arranger, lyricist, pianist, record producer and music publisher.
Born Mariano Detto in Ascoli Piceno, Mariano started his career in 1958 but was launched by entering the Adriano Celentano's "Clan Celentano", becoming keyboardist in his accompanying group "I Ribelli", sporadic lyricist and official arranger of all the songs of the clan between 1962 and 1967. He also collaborated with Lucio Battisti, Mina, Milva, Equipe 84. Later he focused on composing numerous film soundtracks, especially comedy films.