The 2009 Women's Premier Soccer League season is the 12th season of the WPSL.
Two teams changed their name in the offseason.
Ten franchises joined the league this year:
Seven teams left the league prior to the beginning of the season:
<small>As of July 6, 2009</small>
<nowiki>*</nowiki> California and Walnut Creek game postponed, not rescheduled since it would not affect standings.