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.

The 1973 New York Mets season was the 12th regular season for the Mets, who played home games at Shea Stadium. Manager Yogi Berra led the team to a National League East title with an 82–79 record and the National League pennant, though they were defeated by the Oakland Athletics in the World Series. Their .509 winning percentage is the lowest of any pennant-winner in major league history. Having won only 82 games during the regular season, they, along with the 2005 San Diego Padres, qualified for the postseason with the fewest regular season wins since Major League Baseball expanded to a 162-game season in 1961, and the fewest of any team since 1885. The season was well known for pitcher Tug McGraw's catchphrase "Ya Gotta Believe!!!"