Blanerne Castle is the remains of a 16th-century fortified house, located in the grounds of Blanerne House, an 18th-century country house between Chirnside and Preston in the Scottish Borders. The house and castle sit on the north bank of the Whiteadder Water, around 6 kilometres (3.7 mi) north-east of Duns. The house is currently operated as a guest house, offering access to fishing and game shooting.