The 2006 Legg Mason Tennis Classic was the 37th edition of this men's tennis tournament and was played on outdoor hard courts.

The tournament was part of the International Series of the 2006 ATP Tour.

FitzGerald Tennis Center in Washington, D.C. in the United States from July 31 through August 6, 2006.

Eleventh-seeded Arnaud Clément won the singles title.

Arnaud Clément defeated Andy Murray, 7–6(7–3), 6–2 Bob Bryan / Mike Bryan defeated Paul Hanley / Kevin Ullyett, 6–3, 5–7, [10–3]