Knowstone is a village and civil parish situated in the North Devon district of Devon, England, halfway between the Mid Devon town of Tiverton, Devon and the North Devon town of South Molton. The hamlet of East Knowstone lies due east of the village. Knowstone was the birthplace of Admiral Sir John Berry (1635–1691), second son of Rev. Daniel Berry (1609–1654), vicar of Knowstone cum Molland. An elaborate mural monument erected by Sir John in 1684 to the memory of his parents survives in Molland Church.
The village lies on the route of the Two Moors Way and Celtic Way Exmoor Option.
Knowstone appears to have included several separate manors at the time of the Domesday Book in 1086. It was within the jurisdiction of South Molton Hundred.
The parish of Knowstone included three notable historic estates:
In the Domesday Book of 1086 Knowstone has four entries:
Tristram Risdon writing in about 1630 stated that in the time of King Henry II (1154–1189) the lord of the manor of "Knowston" was Ailmer de Brett, who granted it to Richard Beaple "whose posterity made this place their dwelling, of which family were divers knights". In the Book of Fees it is recorded that Richard Beupel held "Cnuston" from the feudal barony whose caput was at Marshwood, in Dorset held until the early 13th. century by the Mandeville family, Earls of Essex. In the parish church of Landkey there exist three stone effigies of the Beupel family who held that manor also from the See of Exeter. One of these estates was acquired together with the neighbouring manor of Molland by William de Bottreaux, who gave both churches to Hartland Abbey in 1160. The estate of Beaple was inherited from his wife Margaret de Beaupel by Sir Nele Loring, KG (c.1320–1386) one of the founding members and 20th Knight of the Order of the Garter, established by King Edward III in 1348. He married Margaret de Beaupel, the daughter, and apparently the heiress, of Sir Ralph de Beaupel. There exists today about 1 mile SW of Knowstone village the still-important farmhouse called "Beaple's Barton", bordered to the south by Beaple's Moor and to the north by Beaple's Wood. He appears in ancient records as "Nele Loring of Knowston-Beaupell". By marriage he also came to hold the manor of Landkey, 2 miles east of Barnstaple and 16 miles west of Knowstone. They had the following progeny, two daughters and co-heiresses: