The Beaulieu River, formerly known as the River Exe, is a small river draining much of the central New Forest in Hampshire, southern England. The river has many small upper branches and its farthest source is 8 miles (13 km) from its 4 miles (6 km)-long tidal estuary. Unusually, the river, including its bed, is owned by Lord Montagu of Beaulieu.

The New Forest is one of the largest remaining tracts of unenclosed pasture land, heathland and forest in Southern England, covering southwest Hampshire and southeast Wiltshire. It was proclaimed a royal forest by William the Conqueror, featuring in the Domesday Book.