Deadwater Valley is a 35.9-hectare (89-acre) Local Nature Reserve in Bordon in Hampshire.

It is owned by East Hampshire District Council and managed by the Deadwater Valley Trust.

[1][2] Part of the site is a Scheduled Monument.

[3] This site along the west bank of the River Deadwater has a pond, a meadow, wet and dry heath, alder carr and broadleaved and coniferous woodland.

[1] There are Civil War earthworks in the south of the reserve.