Whiteadder Water is a river in East Lothian and Berwickshire, Scotland. It also flows for a very short distance through Northumberland before joining the River Tweed.
The Whiteadder provides recreational salmon and trout fishing. A number of angling clubs offer access to the river, including the Whiteadder Angling Association (trout) and Berwick and District Angling Association (salmon, sea trout and wild brown trout).
The Whiteadder is the home of the oldest Angling Club in the world verified by the Guinness Book of Records, Ellem Angling Club, established in 1829.
The regalia of the club is on display at Paxton House in Berwickshire. It is also the site of Ninewells, the childhood home of David Hume.
The lowermost section of the Whiteadder is a Site of Special Scientific Interest (SSSI) by virtue of its water crowfoot, salmon, lamprey and moulting mute swan.
