Frans Bak is a Danish composer, choral conductor, saxophonist, and pianist. He is a graduate of the Royal Danish Academy of Music and has worked as a jazz performer and composer of film music. In 1994, he founded the composer's association Den 3. Vej. He plays saxophone, keyboards, and piano. Bak was a member of the bands Blast, Buztop, Santa Cruz, Det Glatte Lag, and Jazzgruppe 90. He was the leader of a quartet and of a big band that included Bob Berg and Randy Brecker.