The 2015 season is the Portland Thorns FC's third season of existence in the National Women's Soccer League, the top division of women's soccer in the United States.

After a disappointing end to the 2014 season that saw the team knocked out of the 2014 NWSL Championship Playoffs by eventual league champions FC Kansas City, head coach Paul Riley sought to make changes that would bolster the team's roster to account for the players who would be called up to their respective national teams during the 2015 FIFA Women's World Cup. After stellar performances in 2014, goalkeeper Nadine Angerer and midfielder Verónica Boquete were both named to the ten player shortlist of the 2014 FIFA World Player of the Year and Boquete was named to the NWSL Best XI as well as being named 2014 Supporters' Player of the Year.

The team made a number of signings before the 2015 season including Genoveva Añonma who captains the Equatorial Guinea women's national football team, a 2015 NWSL College Draft day trade of the Thorns' 2014 season leading scorer Jessica McDonald for Jodie Taylor of the England women's national football team and leading scorer of the Washington Spirit, and defender Kat Williamson, former Thorns player who had been traded away during the 2014 season.

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