Robert Walkup Smith (May 13, 1928 – June 23, 2003), nicknamed "Riverboat",[1] was an American professional baseball player.

He was a left-handed pitcher who appeared in 30 games in the Major Leagues over parts of 1958 and 1959 for the Boston Red Sox, Chicago Cubs and Cleveland Indians.

He earned his only complete game victory as a rookie with the Red Sox on May 20, 1958, at Cleveland Stadium, throwing a three-hitter but walking nine Indians' batters in a 6–1 triumph.

His career coincided with that of Robert Gilchrist Smith, a fellow left-handed pitcher who also came up through the Red Sox' farm system.

Riverboat Smith died, aged 75, at his family farm in his hometown of Clarence, Missouri, on June 23, 2003, from injuries he sustained in a tractor accident.