Chalmer Luman Harris (January 17, 1915 – November 11, 1996) was an American right-handed pitcher, coach, manager, and scout in Major League Baseball.
Born in New Castle, Alabama, Harris began his playing career with the Atlanta Crackers of the Southern Association in 1937.
His catcher that season was Paul Richards, who in 1938 became Atlanta's player-manager.
Richards and Harris would form a decades-long association in baseball at the minor and Major League levels.
The 6 ft 1 in (1.85 m), 185 lb (84 kg) Harris compiled a 35–63 record with a 4.16 earned-run average in 151 American League games with the Philadelphia Athletics and (briefly) Washington Senators in 1941–44 and 1946–47.
He missed the 1945 season while serving in the United States Navy in the Pacific Theater of Operations during World War II.
As a big leaguer, Harris allowed 874 hits and 265 bases on balls in 820 innings pitched and 151 games, with 232 strikeouts.
He pitched at the Triple-A level during his last three active seasons in pro ball.
The remainder of Harris' Major League career would be spent working in tandem with Richards, initially as a coach with the Chicago White Sox (1951–54), Baltimore Orioles (1955–61) and Houston Colt .45s (1962–64).
In each case he worked under Richards, who was either his manager, general manager, or (in Baltimore from 1955 to 1958) both.
Despite his playing background, Harris was never a pitching coach; he usually served as a third-base coach.