Leonel Marshall Steward Sr.[a] (born 31 July 1954), more commonly known as Leonel Marshall Sr., is a Cuban former volleyball player who competed in the 1976 Summer Olympics in Montreal and the 1980 Summer Olympics in Moscow.

[1][2] In 1976, Marshall was part of the Cuban team that won the bronze medal in the Olympic tournament.

[1] Four years later, Marshall finished seventh with the Cuban team in the 1980 Olympic tournament.

[1] Marshall participated in the 1975 Pan American Games in Mexico City and the 1979 Pan American Games in Caguas, winning a gold medal in each event.

[2] Marshall's son, Leonel Marshall Jr., also became a professional volleyball player, and is known for his outstanding vertical jump.