The 2011 Legg Mason Tennis Classic was a men's tennis tournament played on outdoor hard courts.

It was the 43rd edition of this event and was part of the ATP World Tour 500 series of the 2011 ATP World Tour.

FitzGerald Tennis Center in Washington, D.C. in the United States from July 30 through August 7, 2011.

Unseeded Radek Štěpánek won the singles title.

Radek Štěpánek defeated Gaël Monfils, 6–4, 6–4 Michaël Llodra / Nenad Zimonjić defeated Robert Lindstedt / Horia Tecău, 6–7(3–7), 7–6(8–6), [10–7] The following players received wildcards into the singles main draw The following players received entry from the qualifying draw: The following players received entry as lucky losers into the singles main draw: