Leslie House is a Grade A listed historic building located in Glenrothes, Fife. It is the largest and earliest Restoration house in Fife, Scotland, and was the seat of the Earls of Rothes for over 250 years. Sir Robert Spencer-Nairn acquired the house in 1919. The house and its associated grounds were formally incorporated into the Glenrothes new town designated area in 1948 and much of the grounds were used to create Riverside Park. In 1952 the main house and its immediate garden grounds were donated by Sir Robert Nairn to the Church of Scotland where it became a care home for the elderly.