| 2015 season | |||
|---|---|---|---|
 | |||
| General manager | Dave Kasper | ||
| Head coach | Ben Olsen | ||
| Stadium | RFK Stadium | ||
| MLS | Conference: 4th Overall: 8th | ||
| MLS Cup Playoffs | Conference Semifinals | ||
| U.S. Open Cup | Fifth round | ||
| CONCACAF Champions League (14–15) | Quarterfinals | ||
| CONCACAF Champions League (15–16) | Quarterfinals | ||
| Atlantic Cup | Runner-up | ||
| Top goalscorer | League: Chris Rolfe (6) All: Jairo Arrieta (9) | ||
| Highest home attendance | 21,517 ( vs. NYCFC) | ||
| Lowest home attendance | League: 11,218 (June 3 vs. Chicago) All: 8,137 (Mar. 4 vs. Alajuelense) | ||
| Average home league attendance | League: 14,458 All: 13,932 | ||
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The 2015 D.C. United season was the club's twentieth season of existence, and their twentieth in Major League Soccer, the top tier of the American soccer pyramid. The club entered the season as the defending Eastern Conference regular season champions.
Outside of MLS regular season play, the club participated in the 2015 U.S. Open Cup, as well as the knockout stages of the 2014–15 CONCACAF Champions League and group stages of the 2015–16 CONCACAF Champions League.