Thomas Penson, or Thomas Penson the younger (c. 1790 – 1859) was the county surveyor of Denbighshire and Montgomeryshire. An innovative architect and designer of a number of masonry arch bridges over the River Severn and elsewhere. He was the son of Thomas Penson the older, (c. 1760 – 1824), who had been the county surveyor for Flintshire from 1810 to 1814, but had been dismissed when the bridge at Overton-on-Dee collapsed. Thomas Penson the younger, completed its replacement. Thomas Penson the younger had two sons: Thomas Mainwaring Penson (died 1864) and Richard Kyrke Penson (died 1886), both of whom were architects and both practised in Chester