The 2005 Legg Mason Tenis Classic was the 36th edition of this tennis tournament and was played on outdoor hard courts. The tournament was part of the International Series of the 2005 ATP Tour. It was held at the William H.G. FitzGerald Tennis Center in Washington, D.C. from August 1 through August 7, 2005.
Andy Roddick defeated James Blake, 7–5, 6–3
- It was Roddick's 4th title of the year and the 19th of his career.
Bob Bryan / Mike Bryan defeated Wayne Black / Kevin Ullyett, 6–4, 6–2