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.

Rivers was born in El Reno, Oklahoma, United States. His father was a gospel musician who had sung with the Fisk Jubilee Singers and the Silverstone Quartet, exposing Rivers to music from an early age. His grandfather was Marshall W. Taylor, a religious leader from Kentucky. Rivers was stationed in California in the 1940s during a stint in the Navy. Here he performed semi-regularly with blues singer Jimmy Witherspoon. Rivers moved to Boston, Massachusetts in 1947, where he studied at the Boston Conservatory with Alan Hovhaness.

He performed with Quincy Jones, Herb Pomeroy, Tadd Dameron and others.