Riddings Junction Viaduct (or Riddings Viaduct) is a disused cross-border railway bridge over Liddel Water between Kirkandrews, in Cumbria, north-western England, and Canonbie in Dumfries and Galloway, south-western Scotland.

[2] The viaduct consists of nine semi-elliptical, depressed arches on an unusually sharp skew, crossing the river in a sweeping curve.

[3][4] The viaduct was built for the North British Railway at the very beginning of its branch from Riddings Junction on the outskirts of Carlisle to Langholm in Scotland, part of the Waverley Route.

It opened on 18 March 1864 and closed, with the rest of the line, on 18 September 1967; the viaduct has been disused ever since.

It carried a single track for its entire operational life; the rails were removed when the line closed.