| Devon Longwool | |
| Status: | extinct |
| Also Known As: | Devon Longwoolled |
| Country: | United Kingdom |
| Distribution: | northern Devon, southern Somerset |
| Type: | upland |
| Use: | wool |
| Facecolour: | white |
| Horns: | polled (hornless) |
The Devon Longwool was a British breed of domestic sheep from south-west England. It was distributed in southern Somerset and northern Devon, and was – like the Greyface Dartmoor and the South Devon – a polled longwool sheep. It is now considered extinct, as in 1977 it was merged with the South Devon to form the Devon and Cornwall Longwool.
A breed society, the Devon Longwool Sheep Breed Society, was formed in 1898. A flock book was begun in 1900.