Simonburn is a small human settlement in Northumberland, England.

Simonburn lies to the north of Hadrian's Wall, the most noted Roman monument in Britain.

The length of Hadrian's Wall is 117 kilometres, spanning the width of Britain; the wall incorporates the Vallum,[2] a rearward ditch system, and was constructed chiefly to prevent harrying by small bands of raiders and unwanted immigration from the north, not as a fighting front for a major invasion.

Nunwick Hall is a privately owned 18th-century country house nearby.

The castle was subsequently dismantled by treasure hunters.