The 2017 Seattle Reign FC season was the club's fifth season of play in the National Women's Soccer League (NWSL), the top division of women's soccer in the United States.

[1] Last updated: June 18, 2017Source: https://medium.com/@ReignFC/kim-calkins-named-technical-director-of-reign-academy-370eae9ff922 Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

[10] For transfers in, dates listed are when the Reign FC officially signed the players to the roster.

Transactions where only the rights to the players are acquired (e.g., draft picks) are not listed, and amateur call-ups are not considered official signings either.

For transfers out, dates listed are when the Reign FC officially removed the players from its roster, not when they signed with another club.