Michael Grant Marshall was an American professional baseball pitcher. He played in Major League Baseball (MLB) in 1967 and from 1969 through 1981 for nine different teams. Marshall won the National League Cy Young Award in 1974 as a Los Angeles Dodger and was a two-time All-Star selection. He was the first relief pitcher to receive the Cy Young Award.

The Cy Young Award is given annually to the best pitchers in Major League Baseball (MLB), one each for the American League (AL) and National League (NL). The award was introduced in 1956 by Baseball Commissioner Ford Frick in honor of Hall of Fame pitcher Cy Young, who died in 1955. The award was originally given to the single best pitcher in the major leagues, but in 1967, after the retirement of Frick, the award was given to one pitcher in each league.