Portland Thorns FC is an American professional soccer team based in Portland, Oregon, that competes in the National Women's Soccer League (NWSL). Established in 2012, the team began play in 2013 in the then-eight-team NWSL, which received support from the United States Soccer Federation (USSF).

In its inaugural season, Portland Thorns FC placed third during the regular season and, in the playoffs, won the first NWSL championship. The club won the NWSL Shield in 2016 and a second NWSL Championship in 2017. In 2020, they won the Community Shield with the best record in the 2020 NWSL Fall Series. In 2021, the Thorns won the NWSL Challenge Cup, the Women's International Champions Cup, and the NWSL Shield. They followed up in 2022 by winning the NWSL championship.

The Thorns have had the highest average attendance in the league in each of their first eight regular seasons, and set the club's all-time attendance record with a capacity 25,218 attendance on August 11, 2019, in a match against the North Carolina Courage that also set the league's record at the time.