Edlingham Castle is a small castle ruin, in the care of English Heritage, in a valley to the West of Alnwick, Northumberland, England. Edlingham itself is little more than a hamlet with a church alongside the castle.

The ruins are mostly laid low though much of the keep still stands despite an impressive crack running several stories down to ground level.

The castle - more properly a fortified manor house typical of many medieval houses in the north of England - guards one of the few approaches to Alnwick through the hills to its West. Its fortifications were increased in response to the border warfare which raged between England and Scotland in the period from about 1300 to 1600.