Steven Charles Barr (born September 8, 1951) is a retired American professional baseball player.

A left-handed pitcher, he worked in 24 games in Major League Baseball between 1974 and 1976 for the Boston Red Sox and the Texas Rangers.

In his MLB debut, Barr threw a complete game 7–4 victory against the Cleveland Indians, scattering seven hits and six bases on balls.

Then, on November 17, he was included in one of the off-season's blockbuster trades when he was sent to the Rangers with outfielder Juan Beníquez for future Baseball Hall of Fame pitcher Ferguson Jenkins.

In his first start, April 13 against the defending American League West champion Oakland Athletics, Barr threw a complete game, four-hit, 3–1 victory, striking out seven.