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.

While visiting an aunt in California at age 20, Clark decided to stay and began working with saxophonist Wardell Gray.

Clark toured the United States and Europe with DeFranco until January 1956, when he joined The Lighthouse All-Stars, led by bassist Howard Rumsey.

Wishing to return to the east coast, Clark served as accompanist for singer Dinah Washington in February 1957 in order to relocate to New York City.

He frequently recorded for Blue Note Records as one of their house musicians, playing as a sideman with many hard bop players, including Kenny Burrell, Donald Byrd, Paul Chambers, John Coltrane, Dexter Gordon, Art Farmer, Curtis Fuller, Grant Green, Philly Joe Jones, Clifford Jordan, Jackie McLean, Hank Mobley, Art Taylor, and Wilbur Ware.