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.
A native of Strasburg, Virginia, McQuillen attended what is now McDaniel College in Westminster, Maryland, and reported immediately to the Browns upon signing with them in 1938.
In his first professional and Major League game, he hit a double as a pinch hitter off Johnny Marcum of the Boston Red Sox, collecting his first run batted in during a 12–8 loss at Sportsman's Park.
Following his major league stint, he spent 10 years playing and managing in the minors, leaving baseball after the 1956 season.