The baritone saxophone is a member of the saxophone family of instruments, larger than the tenor saxophone, but smaller than the bass. It is the lowest-pitched saxophone in common use — the bass, contrabass and subcontrabass saxophones are relatively uncommon. Like all saxophones, it is a single-reed instrument. It is commonly used in concert bands, chamber music, military bands, big bands, and jazz combos. It can also be found in other ensembles such as rock bands and marching bands. Modern baritone saxophones are pitched in E♭.

The Selmer Mark VI is a saxophone produced from 1954 to 1981. Production shifted to the Mark VII for the tenor and alto in the mid-1970s, and to the Super Action 80 for the soprano and baritone saxophones in 1981. The sopranino saw limited production until about 1985.