The 2009 Women's National Invitation Tournament (WNIT) was a single-elimination tournament of 48 National Collegiate Athletic Association (NCAA) Division I teams that did not participate in the 2009 NCAA Division I women's basketball tournament. It was won by South Florida. The 41st annual tournament was played from March 18, 2009 to April 4, 2009, entirely on campus sites. The highest ranked team in each conference that did not receive a bid to the NCAA Tournament received an automatic bid to this tournament. The remaining slots were filled by the WNIT Selection Committee.