Nether Horsburgh Castle is a ruined tower house near Cardrona, in the Scottish Borders, in the former county of Peebleshire.
The remains of Nether Horsburgh Castle consist of a ruined, 16th-century rectangular tower-house, at the foot of a rolling valley overlooking the River Tweed, with the Hope Burn flowing just a few meters to the east.
It is thought that the tower rose to a height of four stories, with an entrance situated at ground level on the northeast side of the building.
All that remains of this is a small fragment of the northern segment, which now forms a part of the field boundary in which the castle stands.
This is Horsburgh Castle, also of the 16th century, and just north of Peebles, high on the side of Mailingsland Hill, stands the remains of Hutchinfield Tower.