The 2003 Chicago Cubs season was the 132nd season of the Chicago Cubs franchise, the 128th in the National League and the 88th at Wrigley Field. The Cubs were managed by Dusty Baker in his first year in Chicago. The Cubs went 88–74 during the 2003 season and won the National League Central for the first time since the division's formation in 1994, and the team's first division title since its 1989 NL East title. In the NLDS, the Cubs defeated the Atlanta Braves three games to two for their first postseason series win since 1908. The Cubs lost to the Florida Marlins four games to three in the NLCS.

Johnnie B "Dusty" Baker Jr. is an American former professional baseball outfielder and manager in Major League Baseball (MLB). He played in MLB for 19 seasons with the Atlanta Braves, Los Angeles Dodgers, San Francisco Giants, and Oakland Athletics. During his Dodgers tenure, he was a two-time All-Star, won two Silver Slugger Awards and a Gold Glove Award, and became the first NLCS MVP, which he received during the 1977 National League Championship Series. He also made three World Series appearances with the Dodgers, and was a member of the 1981 championship team.