Ronald Charles Cey (; born February 15, 1948) is an American former professional baseball player, a third baseman in the major leagues.
He played for the Los Angeles Dodgers (1971–82), Chicago Cubs (1983–86), and Oakland Athletics (1987).
Cey batted and threw right-handed; a popular player, he was nicknamed "The Penguin" for his slow waddling running gait by his college coach, Chuck "Bobo" Brayton.