The 1939 World Series featured the three-time defending champion New York Yankees against the Cincinnati Reds, who were making their first Series appearance since winning the scandal-tainted 1919 World Series. The Yankees swept the Series in four games for the second straight year, winning their record fourth consecutive title. Yankee manager Joe McCarthy won his fifth title, tying the record held by Philadelphia Athletics manager Connie Mack.

Joseph Vincent McCarthy was an American manager in Major League Baseball, most renowned for his leadership of the "Bronx Bombers" teams of the New York Yankees from 1931 to 1946. The first manager to win pennants with both National and American League teams, he won a total nine league pennants and seven World Series championships – the latter is a record tied only by Casey Stengel. McCarthy was elected to the Baseball Hall of Fame in 1957. He recorded a 100-win season six times, a record matched only by Bobby Cox. McCarthy's career winning percentages in both the regular season (.615) and postseason are the highest in major league history. His 2,125 career victories rank ninth all-time in major league history for managerial wins, and he ranks first all-time for the Yankees with 1,460 wins.