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Arthington Viaduct (also known as Wharfedale Viaduct or Castley Viaduct) carries the Harrogate Line across the Wharfe valley between Arthington in West Yorkshire and Castley in North Yorkshire. It is a Grade II listed structure.
The viaduct was built, between 1845 and 1849, in a curve some 460 metres in length, with 21 semi-circular arches on high piers. Construction was supervised by engineer Thomas Grainger, Chief Engineer of the Leeds and Thirsk Railway, who built the line from Leeds to Stockton-on-Tees via Harrogate and Thirsk. The Foundation Stone was laid on 31 March 1846 and the line opened on 10 July 1849 when the nearby Bramhope Tunnel, another key component of the line, was complete.

The Harrogate Line is a rail line through parts of North Yorkshire and the West Yorkshire Metro area connecting Leeds to York by way of Harrogate and Knaresborough. The service is operated by Northern Rail, with a few additional workings by East Coast. Metro's bus and rail MetroCard ticket is available for journeys between Leeds and Harrogate. The line opened in 1848.
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