Robert Gilchrist Smith (February 1, 1931 – April 1, 2013) was an American professional baseball player, a left-handed pitcher who played for the Boston Red Sox, St. Louis Cardinals, Pittsburgh Pirates and Detroit Tigers of Major League Baseball in all or part of four seasons spanning 1955 through 1959.

Born in Woodsville, a village of Haverhill, New Hampshire, he was listed as 6 feet 1 inch (1.85 m) tall and 190 pounds (86 kg).

Smith's played minor and major league baseball for 15 years (1948–51; 1954–64), interrupted by military service during the Korean War.

After spending the remainder of 1955 and all of 1956 at the top level of minor league baseball, Smith was drafted out of the Red Sox organization by St. Louis in the 1956 Rule 5 lottery.

Thrust into a starting role late in the year, he threw a complete game, eight-hit victory over the Philadelphia Phillies on September 8.