| Hezlett House | |
| Alternate Names: | Liffock House |
| Image Alt: | Hezlett House in 2007 |
| Map Type: | Northern Ireland |
| Owner: | National Trust for Places of Historic Interest or Natural Beauty |
| Location Town: | Castlerock |
| Location Country: | Northern Ireland |
| Coordinates: | 55.155°N -6.7899°W |
| Completion Date: | 1691 |
Hezlett House is a 17th-century thatched cottage located in Castlerock, County Londonderry. Built around 1691,[1] it is one of the oldest buildings still in use anywhere in Ulster. The cottage has a cruck structure and is situated at the crossroads near the village. It was originally a rectory or farmhouse.