Westholme House is a historic building in the English market town of Sleaford in Lincolnshire, set in 32 acres of parkland and school grounds. Built around 1849 in the style of a French Gothic mansion by Charles Kirk for his business partner Thomas Parry, it was privately owned until the 1940s, when Kesteven County Council acquired the house and its grounds. It subsequently served as the county library and part of Sleaford Secondary Modern School (later St George's Academy). The stone house follows an asymmetrical layout and incorporates a range of Gothic elements in its design. In 1974, it was recorded in the National Heritage List for England as a designated Grade II listed building, recognising it as of "special interest".