Sizergh Castle and Garden is a stately home and garden at Helsington in the English county of Cumbria, about 4 miles 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.