Tacoma Defiance, formerly Seattle Sounders FC 2, is an American professional soccer team based in Puget Sound region in Tukwila, Washington, U.S. that competes in the MLS Next Pro, the third tier of the United States soccer league system, as the reserve team of Seattle Sounders FC. Formerly, 20 percent of the club was fan-owned through the non-profit Sounders Community Trust.

Tukwila is a suburban city in King County, Washington, United States, located immediately to the south of Seattle. The population was 21,798 at the 2020 census.