1973 Major League Baseball season

The 1973 Major League Baseball season was the first season of play for the designated hitter in the American League. The Kansas City Royals moved their home games from Municipal Stadium to the new Royals Stadium, adjacent to the Chiefs' football facility, Arrowhead Stadium. Royals Stadium also played host to the 1973 All-Star Game on July 24, with the NL defeating the AL, 7–1.

California Angels ace pitcher Nolan Ryan broke Sandy Koufax's 1965 strikeout record of 382 when he struck out 383 batters during the season.

The Oakland Athletics won their second straight World Series championship in seven games, over the New York Mets.