| Date: | August 1–7 |
| Edition: | 36th |
| Category: | International Series |
| Prize Money: | $575,000 |
| Draw: | 64S / 16D |
| Surface: | Hard / outdoor |
| Venue: | William H.G. FitzGerald Tennis Center |
| Location: | Washington, D.C., United States |
| Champs: |  Andy Roddick[1] |
| Champd: | Bob Bryan / Mike Bryan[2] |
| Main Name: | Washington Open (tennis) Washington Open |
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.
See main article: article and 2005 Legg Mason Tennis Classic – Singles. Andy Roddick defeated James Blake, 7–5, 6–3
See main article: article and 2005 Legg Mason Tennis Classic – Doubles. Bob Bryan / Mike Bryan defeated Wayne Black / Kevin Ullyett, 6–4, 6–2