The Melingriffith Tin Plate Works (alternate: Melingriffith Tin and Iron Works; Welsh, Melingruffydd; translation, "Griffith's Mill") were post medieval tin and iron works located on Tŷ-mawr Road, in Whitchurch, Cardiff, Wales. Founded sometime before 1750, it was the largest tin-plate works in the world by the end of the 18th century. Subsequent to the closure of tin plate works in 1957, the 200-year-old Melingriffith water pump was named a scheduled monument. It is one of the earliest and most important works of its kind, and may be "the most notable surviving monument of the tinplate industry".