Darold Duane Knowles is an American former professional baseball pitcher and coach, who played in Major League Baseball (MLB) 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 / Texas Rangers, Chicago Cubs, Montreal Expos, and St. Louis Cardinals. Knowles batted and threw left-handed. In 2014, he was hired as the pitching coach of the Florida State League's Dunedin Blue Jays.

The 1973 World Series was the championship series of Major League Baseball's (MLB) 1973 season. The 70th edition of the World Series, it was a best-of-seven playoff played between the American League (AL) champion Oakland Athletics and the National League (NL) champion New York Mets. The Athletics won the series in seven games for their second of three consecutive World Series titles and their seventh championship overall.