The 2015 Citi Open was a tennis tournament played on outdoor hard courts. It was the 47th edition (for the men) and the 5th edition (for the women) of the Washington Open. The event was part of the ATP World Tour 500 series of the 2015 ATP World Tour, and of the WTA International tournaments of the 2015 WTA Tour. It took place at the William H.G. FitzGerald Tennis Center in Washington, D.C., United States, from August 3 to August 9, 2015.