Craigellachie Bridge is a cast iron arch bridge across the River Spey at Craigellachie, near to the village of Aberlour in Moray, Scotland. It was designed by the renowned civil engineer Thomas Telford and built from 1812–1814. It is a Category A listed structure. 
The bridge has a single span of approximately 46 metres (151 ft) and was revolutionary for its time, in that it used an extremely slender arch which was not possible using traditional masonry construction. The ironwork was cast at the Plas Kynaston iron foundry at Cefn Mawr, near Ruabon in Denbighshire by William Hazledine, who cast a number of Telford bridges. The ironwork was transported from the foundry through the Ellesmere Canal and Pontcysyllte Aqueduct then by sea to Speymouth, where it was loaded onto wagons and taken to the site. Testing in the 1960s revealed that the cast-iron had an unusually high tensile strength. This was probably specified by Telford because, unlike in traditional masonry arch bridges, some sections of the arch are not in compression under loading.
The bridge was in regular use until 1963, when it was closed for a major refurbishment. The side railings and spandrel members were replaced with new ironwork fabricated to match the originals. A 14 ton restriction was placed on the bridge at this point. This, along with the fact that the road to the north of the bridge takes a sharp right-angled turn to avoid a rock face, made it unsuitable for modern vehicles. Despite this it carried foot and vehicle traffic across the River Spey until 1972, when its function was replaced by a reinforced concrete bridge built by Sir William Arrol & Co. which opened in 1970 and carries the A941 road today. Telford's bridge remains in good condition, and is still open to pedestrians and cyclists. The bridge has been given Category A listed status by Historic Scotland and has been designated a civil engineering landmark by the Institution of Civil Engineers and American Society of Civil Engineers. The bridge was commemorated on a stamp in 2015.
It was also the site of a parade upon the amalgamation of The Gordon Highlanders and The Queen's Own Highlanders (Seaforth and Camerons) to form The Highlanders (Seaforth, Gordons and Camerons) in 1994. A plaque has been fitted to the bridge parapet to commemorate this. Another plaque records the bridge's restoration in 1964.
The bridge is featured in the artwork and logos of Spey Valley Brewery who brew an 1814 lager in commemoration of the bridge.
- "CRAIGELLACHIE, OLD BRIDGE OVER RIVER SPEY (TELFORD BRIDGE) (Ref:2357)". Historic Scotland. Retrieved 27 May 2015.
- "1814 Spey Valley Lager". Spey Valley Brewery.
- Nelson, Gillian. Highland Bridges. Aberdeen University Press. 1990. ISBN 0-08-037744-0
- Paxton, Roland. Thomas Telford's Cast-Iron Bridges, Proceedings of the Institution of Civil Engineers, Volume 160, Special Issue One. ISSN 0965-089-X
|Wikimedia Commons has media related to Craigellachie Bridge.|
- Detail on the bridge - Scottish Historical Register
- Musical notation for the Craigellachie Bridge Strathspey Reel
- grid reference