Dorman Long & Co was a UK steel producer, later diversifying into bridge building.

The company was founded by Arthur Dorman and Albert de Lande Long when they acquired West Marsh Iron Works in 1875.

[1] In the 1920s Dorman Long took over the concerns of Bell Brothers and Bolckow and Vaughan and diversified into the construction of bridges.

[12][13] 1946: Dorman Long purchases 600 acres (2.4 km2) of land between the Redcar and Cleveland Works to build the Lackenby development.

The greatest example of Dorman Long's work in Teesside itself is the single-span Newport Lifting Bridge (a Grade II Listed Building).

Amongst the museum's exhibits is a collection of ceramics from the local Linthorpe Pottery, which was known for its iridescent glazes which, at the time, were not produced anywhere else in Europe.

[15] The emergency listing cited its significance as a "recognised and celebrated example of early Brutalist architecture", a "nationally unique surviving structure from the twentieth-century coal, iron and steel industries" as well as "for its association with, and an advert for, Dorman Long which dominated the steel and heavy engineering industry of Teesside".