Robert Trowbridge (June 27, 1930 – April 3, 1980) was an American professional baseball player, a pitcher who appeared in all or parts of five seasons (1956–60) for the Milwaukee Braves and Kansas City Athletics.

Born in Hudson, New York, Trowbridge was signed in 1950 by the Boston Braves, and won 16 games in his debut season in the Class C Northern League.

His final appearance in 1959, and as a Brave, occurred on August 18, five weeks before Milwaukee met the Los Angeles Dodgers in the 1959 National League tie-breaker series.

The Braves sold Trowbridge's contract during the 1959–60 off-season to the Kansas City Athletics, a second-division team in the American League, and he finished his MLB career there in 1960, making one start and relieving in 21 other games before being sent to Triple-A.

As a major leaguer, Trowbridge compiled a 13–13 record with a 3.95 earned run average and 201 strikeouts in 116 appearances and 3301⁄3 innings pitched, allowing 324 hits and 156 bases on balls.