Bredbo River railway bridge, Bredbo, Railway bridge in Bredbo, New South Wales, Australia.

The Bredbo River railway bridge is a timber structure built with a traditional deck truss design that carries the railway across the waterway. It spans the river in ten sections, each relatively short, allowing for simple construction methods and durable timber joinery.

Built between 1881 and 1889, the bridge was designed as part of the railway line connecting Queanbeyan to Cooma in inland New South Wales. It became essential infrastructure that opened access to the mining and rural areas of the southern highlands.

The bridge's name honours the Bredbo River it crosses on the Bombala line, and its Queen post deck truss design was copied from Isambard Kingdom Brunel's St Germans viaduct in Cornwall, built about 30 years earlier. It is one of only two such timber viaducts on the Cooma line, the other crossing Ingalara Creek at Michelago.

The viaduct can be reached from the Monaro Highway, which runs close to the river crossing at Bredbo. Rail services over the bridge are suspended, so it is seen from the road and riverbank rather than from a train. The structure was reported in fair condition in 2006 owing to lack of maintenance.

The bridge incorporates a timber deck truss pattern adapted from British railway designs but executed with Australian hardwood species. This fusion of imported engineering knowledge with local materials reflects how colonial engineers modified proven techniques for their specific environment.