Robert Alan Dressler (born February 2, 1954) is a former Major League Baseball pitcher who played for the San Francisco Giants, St. Louis Cardinals, and Seattle Mariners.
Dressler was drafted by the San Francisco Giants in the 1st round (19th overall) in the 1972 Major League Baseball Draft and made his major league debut for the Giants in . On July 24, , he was traded to the St. Louis Cardinals for John Tamargo and purchased by the Seattle Mariners on June 7, . In his final major league season in , Dressler had a 3.98 ERA in 149.1 innings pitched.