Idless (Cornish: Edhelys, meaning place of aspen trees) is a hamlet north of Truro in Cornwall, England. The River Allen rises north of St Allen and flows southwards through the Idless Valley into Truro. It is in the civil parish of Kenwyn
The manor of Idless was recorded in the Domesday Book (1086) when it was held by Algar from Robert, Count of Mortain. There was one hide of land and land for 6 ploughs. Algar had one third of a virgate with 3 ploughs and 4 serfs. 4 villeins and 7 smallholders had the rest of the land. There were 40 acres of woodland, 2 square leagues of pasture, 23 sheep and 7 goats. The value of the manor was 15 shillings though it had formerly been £2 sterling.
Coordinates: 50°17′13″N 5°03′38″W / 50.2869325°N 5.060517°W