Benjamin Alexander Riley Jr. was an American jazz drummer known primarily for his work with Sonny Rollins and Thelonious Monk. Riley worked with a number of other musicians throughout his prolific career as a sideman, such as Alice Coltrane, Stan Getz, Eddie "Lockjaw" Davis, and Ahmad Jamal. Riley was also a member of the group Sphere, and during the 1970s and 1980s, he was a member of the New York Jazz Quartet.