Trelissick (Cornish: Trelesyk) is a house and garden in the ownership of the National Trust at Feock, near Truro, Cornwall, England.

[3] The house was designed around 1750 by the paternal grandfather of Humphry Davy for John Lawrence and remodelled in the 1820s by Thomas Daniell.

[4] The estate has been in the ownership of the National Trust since 1955 when it was donated by Ida Copeland following the death of her son Geoffrey, on the understanding that the family could continue to reside there.

The house and garden had formerly been owned and developed by the Daniell family, which had made its fortune in the 18th century Cornish copper mining industry.

The Copeland family crest, a horse's head, now decorates the weathervane on the turret of the stable block, making a pair with the Gilbert squirrels on the Victorian Gothic water tower, an echo of the family who lived here in the second half of the 19th century (their ancestor, Sir Humphrey Gilbert, was lost at sea in his ship Squirrel after discovering Newfoundland).