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Curtis Allan Hasler (born December 29, 1964) is an American professional baseball coach and former pitcher. On October 14, 2016, he was named the 2017 bullpen coach for the Chicago White Sox of Major League Baseball.
Hasler is a native of Honolulu who has spent his entire professional career in the White Sox organization. A 6 ft 7 in (2.01 m), 215 lb (98 kg) right-handed pitcher, he attended Bradley University and was selected by the ChiSox in the 21st round of the 1987 Major League Baseball Draft. He pitched for five seasons (1987–91) in the club's farm system, posting a win–loss record of 34–30 and an earned run average of 3.51 in 97 minor-league games and 561 2⁄3 innings pitched. He appeared in 11 games at the Triple-A level in his final active season.
In 1992, he became a pitching coach at the Rookie level in the White Sox' system, and continued in that role until he became roving minor league pitching coordinator from 2011–16. The 2017 season marks his 30th year in the Chicago organization and his first in the Major Leagues as bullpen coach on the staff of Rick Renteria.