Ronald Peter Perranoski (April 1, 1936 – October 2, 2020) was an American professional baseball player and coach. He played in Major League Baseball as a left-handed relief pitcher from 1961 to 1973, most prominently as a member of the Los Angeles Dodgers for whom he appeared in three World Series and, with the Minnesota Twins teams that won two consecutive American League Western Division titles. He also played for the Detroit Tigers and the California Angels. After his playing career, Perranoski worked as a Major League pitching coach, winning two more World Series with the Dodgers in the 1980s.