List of D.C. United seasons

D.C. United is an American professional soccer club based in Washington, D.C. that competes in Major League Soccer, the top tier professional soccer league in the United States and Canada. It is one of the ten charter clubs of MLS, having competed in the league since its inception, in 1996. Over the club's history, D.C. United has been considered to be the flagship franchise of MLS winning 13 international and domestic titles. Domestically, United has won the U.S. Open Cup thrice, and holds an MLS record for most MLS Cup and MLS Supporters' Shields apiece, winning each honor four times. United was also the first club to win both the Supporters' Shield and MLS Cup consecutively.
On the international stage, D.C. United has competed in both the CONCACAF Champions League and its predecessor the CONCACAF Champions' Cup. The club is also the only American soccer club to ever compete in a CONMEBOL competition, participating in the 2005 and 2007 editions of the Copa Sudamericana. In 1998, the club won the CONCACAF Champions' Cup. Subsequently, United won the now-defunct Copa Interamericana, a competition between the CONCACAF on CONMEBOL champion that year to determine the best soccer club in the Americas. In the 1998, and final edition of the Copa Interamericana, D.C. United defeated Vasco da Gama of Brazil to take the title.

Key

;Key to competitions

Major League Soccer – The [United States Association football|soccer league system|top-flight] of soccer in the United States, established in 1996.
U.S. Open Cup – The premier knockout cup competition in U.S. soccer, first contested in 1914.
CONCACAF Champions League – The premier competition in North American soccer since 1962. It went by the name of Champions' Cup until 2008.

;Key to colors and symbols:

;Key to league record

;Key to cup record