Ashley Park is a private residential neighbourhood at Walton-on-Thames in Surrey. Its central feature was a grandiose English country house, at times enjoying associated medieval manorial rights, which stood on the site, with alterations, between 1605 and the early 1920s. Its owners included Charles Sackville, 2nd Duke of Dorset, in the 18th century and members of the Sassoon family around the turn of the 20th century.
The bulk of the estate was developed into detached houses in the inter-war period, often rebuilt since in a modernist style with American influences; older examples tend to be in the Arts and Crafts style, its principal local exponent being Walter George Tarrant. Houses sold by its development company are more strictly subject to covenants mandating low density residential development.