Robert Max "Sugar" Cain (October 16, 1924 – April 8, 1997) was an American Major League Baseball pitcher with the Chicago White Sox, Detroit Tigers and St. Louis Browns between 1949 and 1954.

On August 19, 1951, Cain was the pitcher who issued a base on balls to Eddie Gaedel, at 3 feet 7 inches (109 cm) the shortest person to appear in a major league game.

[2] On August 19, 1951, St. Louis Browns owner Bill Veeck put the 3 foot, 7 inch Eddie Gaedel into the game with instructions to hold his bat on his shoulder and not swing.

Cain played in 150 major league games, with 140 appearances as a pitcher, for 628 innings, with a career record of 37–44 and an earned run average of 4.50.

After leaving baseball, Cain lived in Euclid, Ohio, for the last 40 years of his life, and died of cancer in Cleveland at age 72.