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.