Delaval is the surname of a family of gentry/aristocracy in Northumberland, England, from the 11th century to the 19th century. Their main estate was the manor of Seaton Delaval. The 18th century Delavals are noteworthy for their colourful lifestyle, for the magnificent Seaton Delaval Hall and for the development of the little seaport of Seaton Sluice and a coal mine at Old Hartley.

Seaton Delaval is a village and former civil parish, now in the parish of Seaton Valley, in Northumberland, England, with a population of 4,371. The largest of the five villages in Seaton Valley, it is the site of Seaton Delaval Hall, completed by Sir John Vanbrugh in 1727.