Ronald Mark Blomberg, nicknamed "Boomer", is an American former professional baseball player and minor league manager. He played in Major League Baseball as a designated hitter, first baseman, and right fielder. He played for the New York Yankees and Chicago White Sox (1978), and was the manager of the Bet Shemesh Blue Sox in the Israel Baseball League (2007). He was the first designated hitter in Major League Baseball history. He batted left-handed, and threw right-handed.

The designated hitter (DH) is a baseball player who bats in place of another position player, most commonly the pitcher.