The 2011 Seattle Sounders FC season was the club's third season in Major League Soccer, the United States' top-tier of professional soccer. It was the Sounders FC organization's third year of existence; including all previous clubs, it was the 31st season of a soccer team bearing the Sounders name.

The 2011 season is the third season for Seattle Sounders FC who began play in 2009 as the league's 15th team. In their inaugural season, Sounders FC became the second MLS expansion team in league history (Chicago was first) to win the U.S. Open Cup tournament in their first season. They did so by defeating D.C. United 2–1 on the road at RFK Stadium. In winning the U.S. Open Cup tournament, Sounders FC qualified for the preliminary round of the 2010–11 CONCACAF Champions League. During the preliminary round, they were paired up with the defending Primera División winners, Isidro Metapán. After winning the first leg by a score of 1–0, Seattle went to El Salvador to play the second.

On 22 November 2010, Seattle made a trade with the Colorado Rapids for defenders Julien Baudet of France and Danny Earls of the Republic of Ireland for Peter Vagenas. Also, the list of the ten protected players for the 2010 MLS Expansion Draft was decided by the club. The draft took place on 24 November 2010 when both the Portland Timbers and Vancouver Whitecaps FC selected ten players from the Major League Soccer teams, including Sanna Nyassi (who was later traded to Colorado) and Nathan Sturgis (who was later traded to Toronto) from Seattle Sounders FC. Vancouver later traded Jamaican international O'Brian White to Seattle.

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