The River Yeo is a tributary of the River Taw in Devon, England, sometimes known as the Barnstaple Yeo, which enters the Taw at Barnstaple. It is one of several rivers of the same name in Devon, including another tributary of the Taw, the Lapford Yeo.
The Barnstaple Yeo rises on Berry Down, south of Combe Martin. It flows south through the grounds of Arlington Court and past the village of Chelfham.
The last mile of the river is tidal.