Marvin Edward Grissom (March 31, 1918 – September 18, 2005) was an American professional baseball pitcher and pitching coach. During his active career he appeared in 356 games in Major League Baseball for the New York and San Francisco Giants (1946 and 1953–58), Detroit Tigers (1949), Chicago White Sox (1952), Boston Red Sox (1953) and St. Louis Cardinals (1959). Born in Los Molinos, California, he threw and batted right-handed, stood 6 feet 3 inches (1.91 m) tall and weighed 190 pounds (86 kg). His elder brother, Lee, was a left-handed pitcher for four MLB teams between 1934 and 1941.

Grissom's pro career began in 1941 in the Giants' organization, but he missed four seasons (1942–45) serving in the United States Navy during World War II. When he resumed his career in 1946, he was called up from Triple-A in September. As a rookie, Grissom made three starts in four games, dropped each of his two decisions, then spent all of 1947–48 back in the minor leagues. The Tigers selected him in the 1948 Rule 5 draft, and he spent all of 1949 on the Detroit roster, working in 27 games (all but two as a relief pitcher), and posting a poor 2–4 record and 6.41 earned run average. Two more years at Triple-A followed; during the second, 1951, Grissom won 20 games for the Seattle Rainiers. Then, during the 1951–52 offseason, he was acquired by the White Sox.

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