The 2015 D.C. United season is 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 is participating in the 2015 Lamar Hunt 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.

D.C. United entered 2015 with fresh memories of the team's remarkable 2014 campaign, during which the team registered the greatest turnaround in the history of Major League Soccer from one MLS season to the next. The 2014 campaign also saw D.C. United go undefeated in 2014-15 CONCACAF Champions League group play. The team sought to continue its sudden success by maintaining much of the roster that had produced such surprising, consistent and strong results in 2014. In the final month of 2014, the team traded its late-season 2014 acquisition, reserve fullback/midfielder Samuel Inkoom, along with back-up goalkeeper Joe Willis, to the Houston Dynamo, in exchange for the MLS rights to Andrew Driver, whose contract had not been renewed by Houston. The main purpose of the trade was to remove an international player, Inkoom, from the roster, so the team could protect all of the major 2014 players in the 2014 MLS Expansion Draft. In the expansion draft, the team did lose veteran reserve midfielder Lewis Neal along with Thomas McNamara, who had just been acquired by the team in the 2014 MLS Dispersal Draft that followed the dissolution of Chivas USA. The team added depth in the 2015 MLS SuperDraft, selecting a projected winger, Miguel Aguilar, along with a central midfielder from the nearby University of Maryland, Dan Metzger. Several days before the draft, the team also signed veteran Finnish international, Markus Halsti, from the Swedish side Malmö FF. With Malmö, Halsti had played defensive midfield in recent years, after having spent the early years in his career playing as a defender. On the day before the SuperDraft, the team also traded one of its unused international player roster slots to the Columbus Crew in exchange for forward Jairo Arrieta.

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