Samuel Carthorne Rivers (September 25, 1923 – December 26, 2011) was an American jazz musician and composer. Though most famously a tenor saxophonist, he also performed on soprano saxophone, bass clarinet, flute, harmonica, piano and viola. Active in jazz since the early 1950s, he earned wider attention during the mid-1960s spread of free jazz. With a thorough command of music theory, orchestration and composition, Rivers was an influential and prominent artist in jazz music.