Glenn Richard McQuillen (April 19, 1915 – June 8, 1989), known also as "Red", was an American professional baseball player. During a 210-game, five-season career in Major League Baseball, all with the St. Louis Browns, he was a reserve outfielder, playing mainly in left field. He was listed at 6 feet (1.8 m), 198 pounds (90 kg) and batted and threw right-handed. McQuillen died in Gardenville, Maryland, at the age of 74.