Rood Ashton House was a country house in Wiltshire, England, 0.5 miles (0.80 km) northeast of the village of West Ashton. It was once the home of the 1st Viscount Long, and during his residence it was visited by various members of the British Royal Family, including the Prince of Wales, later Edward VIII.
Viscount Long's great grandfather Richard Godolphin Long commissioned architect Jeffry Wyattville to build the house in 1808, replacing an earlier mansion on the estate. It was altered and extended in 1836 by Thomas Hopper, who incorporated some panelling and other material brought from another Long family property, Whaddon House, which had been rescued from a fire there the previous year.
The estate was originally purchased by Edward Long of Monkton in 1597. In the 19th century a considerable amount of money was spent on improving its agriculture, but the Long family saw little return for their expenditure, and the changes in taxation on agricultural land brought about by the Lloyd George government made it financially unviable.
In 1914 during World War I Viscount Long offered Rood Ashton and another of his properties, Culworth House, Northamptonshire for use as convalescent homes for wounded soldiers and sailors.
The house and the remaining 4,100 acres (17 km2) were put to auction by Lord Long's executors in February 1930, six years after his death. The estate included 17 farms, 21 small holdings, 100 cottages, two public houses including The Longs Arms at Steeple Ashton, and a square mile of woodland. 2,500 acres (10 km2) were purchased by a syndicate of his tenants, ending 333 years of continuous ownership by the Long family.