| 2013 season | ||||
|---|---|---|---|---|
 | ||||
| General manager | Adrian Hanauer | |||
| Manager | Sigi Schmid | |||
| Stadium | CenturyLink Field | |||
| Major League Soccer | Conference: 4th Overall: 6th | |||
| MLS Cup Playoffs | Conference Semifinals | |||
| U.S. Open Cup | Third round | |||
| CONCACAF Champions League (2012–13) | Semifinals | |||
| Cascadia Cup | Third place (2–3–1) | |||
| Heritage Cup | Winners (1–1–0) | |||
| Top goalscorer | League: Eddie Johnson (9) All: Eddie Johnson (12) | |||
| Highest home attendance | 67,385 (Aug. 25 vs. Portland)[1] | |||
| Lowest home attendance | 20,520 (Mar. 12 vs. Tigres, CCL) | |||
| Average home league attendance | League: 44,038 Playoffs: 35,355 All: 40,997 | |||
| Biggest win | League: 4–0 vs. San Jose (May 11)[1] | |||
| Biggest defeat | League: 0–4 at LA Galaxy (May 26)[1] 1–5 at Colorado (Oct. 5)[1] | |||
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The 2013 Seattle Sounders FC season was the club's fifth season in Major League Soccer, the United States' top-tier of professional soccer. For the Sounders FC organization, it was their fifth year of existence, and including all previous clubs, it was the 33rd season of soccer in Seattle.