|Born: July 21, 1941|
|June 11, 1967, for the Boston Red Sox|
|Last MLB appearance|
|September 28, 1972, for the Oakland Athletics|
|Earned run average||3.44|
Gary Lee Waslewski (July 21, 1941, in Meriden, Connecticut) is a former American professional baseball player who played as a pitcher from 1967 to 1972. He accrued an 11-26 win-loss record, plus 5 saves in his career, with an ERA of 3.44.
Waslewski made his major league debut in 1967 with the Boston Red Sox. In 1968, he was one of 10 pitchers who led the American League (AL) with a perfect 1.000 fielding percentage. On December 3, 1968, he was traded by the Red Sox to the St. Louis Cardinals for Ducky Schofield. On June 3 the following season, he was traded by the Cardinals to the Montreal Expos for Mudcat Grant. On May 15, 1970, he was traded by the Expos to the New York Yankees for Dave McDonald. Released by the Yankees on April 3, 1972, he signed as a free agent on May 15, 1972, with the Oakland Athletics.
Waslewski also played winter baseball with the Navegantes del Magallanes club of the Venezuelan League in the 1965-66 season. There he hurled a 16-inning, 3-2 victory, the third-most innings pitched in a game in league history, behind Johnny Hetki (18, in 1951-52) and Alex Carrasquel (17, in 1946).