The 2003 WTA Tour was the elite professional tennis circuit organized by the Women's Tennis Association (WTA) for the 2003 tennis season.

The 2003 WTA Tour included the four Grand Slam tournaments, the WTA Tour Championships and the WTA Tier I, Tier II, Tier III, Tier IV and Tier V events.

ITF tournaments were not part of the 2003 WTA Tour, although they award points for the WTA World Ranking.

The table below shows the 2003 WTA Tour schedule.

Below are the 2003 WTA year-end rankings: List of players and titles won, last name alphabetically: The following players won their first title: Titles won by nation: Women's World Tennis circuit|1923]]