South Exmoor (grid reference SS880340) is a 3132.7 hectare (7742.3 acre) biological Site of Special Scientific Interest in Devon and Somerset, England, notified in 1992.

In Devon the site includes Barcombe Down and North Molton Ridge, southeast of South Radworthy, Molland Common, north of Molland, and West Ansty and East Ansty Commons.

The River Barle and its tributaries flow through parts of the site and submerged plants such as alternate watermilfoil (Myriophyllum alterniflorum) are abundant.

The most abundant tree species is sessile oak (Quercus petraea), the shrub layer is very sparse and the ground flora includes bracken, bilberry and a variety of mosses.

Grasshopper warbler (Locustella naevia) breed in scrub and tall heath.