Sir Thomas Strickland was an English politician and soldier. He supported the Royalist cause in the English Civil War, being knighted for his gallantry at the Battle of Edgehill.

Sizergh Castle is a stately home with garden and estate at Helsington in Cumbria, England, about 4 miles (6 km) south of Kendal. Located in historic Westmorland, the castle is a Grade I listed building. While remaining the home of the Hornyold-Strickland family, the castle with its garden and estate is in the care of the National Trust.