Luna Park (also known as Washington Luna Park and Luna Park Washington D.C.) was a trolley park in Alexandria County, Virginia (now Arlington County) that operated between 1906 and 1915. The amusement park was built for $500,000 in just three months by the Washington, Alexandria, and Mount Vernon Electric Railway (later the Washington-Virginia Railway), which was seeking to attract new businesses along its line after nearby racing and gambling establishments closed.
Designed by prominent amusement-park designer Frederick Ingersoll, Luna Park opened to the public in May 1906. It offered a variety of rides, performances, music, picnic grounds, and sports fields. While it was briefly popular, the park was never a financial success, and visitors dwindled over the years. A fire destroyed the roller coaster in 1915, and the park closed soon after. Many of the attractions were disassembled in 1918, though remains of the park persisted at the site for decades afterwards. Part of the former Luna Park is now occupied by Arlington County's sewage treatment facility.