For the similarly named establishment in the US state of Virginia, see Tredegar Iron Works.

Tredegar Ironworks was an important 19th century ironworks at Tredegar, in South Wales. The ironworks was established in 1800 by Samuel Homfray and various partners at Bedwellte Common. It was expanded in the late 1830s and early 1840s, producing significant volumes of rails, largely for export. The works was purchased by the Tredegar Iron Company Limited in 1873 and nine years later began to produce steel. Though now almost entirely redeveloped, traces of the terracing of the valley sides at the site can still be noted at OS grid reference SO 155093.