The Iron Tram Bridge, Robertstown is an early example of a "railway" bridge. It crosses the River Cynon between Trecynon and Robertstown, Wales. It carried the Llwydcoed Tramroad (4 feet 2 inches (1.27 m) gauge) which ran from Hirwaun to the canal head at Cwmbach, south east of Aberdare. It was built by the Aberdare Canal & Navigation Company in 1811, and was probably designed by George Overton.

Little remains of the tramroad but its route is now a footpath. The bridge is a scheduled monument and a Grade II listed building.

The bridge was declared unsafe and was completely removed for renovation. As of 2024, the bridge has reopened.