Darold Duane Knowles (born December 9, 1941) is an American former professional baseball player and coach.
He played as a left-handed pitcher in Major League Baseball from 1965 through 1980, most notably as a member of the Oakland Athletics dynasty that won three consecutive World Series championships between 1972 and 1974.
In the 1973 World Series, Knowles became the first pitcher to appear in all seven games of a World Series.
He also played for the Baltimore Orioles, Philadelphia Phillies, Washington Senators, Chicago Cubs, Texas Rangers, Montreal Expos, and St.
Louis Cardinals.
He batted and threw left-handed.
In 2014, he was hired as the pitching coach of the Florida State League's Dunedin Blue Jays.