Sizergh Castle and Garden is a stately home and garden at Helsington in the English county of Cumbria, about 4 miles (6.4 km) south of Kendal. The castle, a grade I listed building, is in the care of the National Trust along with its garden and estate. It is the home of the Hornyold-Strickland family.
In 2016 the Sizergh estate was included in the newly extended Lake District National Park.
The earliest part of the building is a tower of fourteenth or fifteenth century date.
There are oak-panelled interiors, including the Inlaid Chamber, where the panelling is inlaid with floral and geometric patterns in pale poplar and dark bog-oak. The contents of the Inlaid Chamber were sold to the Victoria and Albert Museum (V&A) in the 1890s and it was displayed as a reconstructed period room. The return of the panelling to its original location at Sizergh was advocated by among others Mark Girouard. The panelling returned in 1999 under a long-term loan. In 2017 it was reported that transfer of ownership to the National Trust had been made formal.
The bargeboards probably date from the seventeenth century.
The Castle contains a variety of paintings, including the following:
Mary Matthews (1823-1890), Mrs Julien-Francois-Bertrand de La Chère.
Marie Louise Geneviève Alice de La Chère (1856-1943), wife of Alfred Joseph Gandolfi-Hornyold (1850-1922).
Lord Thomas Strickland Standish (1763-1813).
Henriette Rose Peronne de Sercey (1770-1849) by François Gérard.
Thomas Strickland Standish of Sizergh (1792-1835).
Ursule Ida de Finguerlin de Bischingen (1805-1846), Mrs Thomas Strickland Standish of Sizergh.