Conrad Yeatis “Sonny” Clark (July 21, 1931 – January 13, 1963) was an American jazz pianist and composer who mainly worked in the hard bop idiom.

Clark was born and raised in Herminie, Pennsylvania, a coal mining town east of Pittsburgh. His parents were originally from Stone Mountain, Georgia. His miner father, Emery Clark, died of a lung disease two weeks after Sonny was born. Sonny was the youngest of eight children. At age 12, he moved to Pittsburgh.

While visiting an aunt in California at age 20, Clark decided to stay and began working with saxophonist Wardell Gray. Clark went to San Francisco with Oscar Pettiford and after a couple months, was working with clarinetist Buddy DeFranco in 1953. Clark toured the United States and Europe with DeFranco until January 1956, when he joined The Lighthouse All-Stars, led by bassist Howard Rumsey. Clark died in New York City on January 13, 1963 (aged 31). The official cause was listed as a heart attack, but the likely cause was a heroin overdose.