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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 1885), both of whom were architects.
Thomas Penson the younger, was a pupil of the architect and bridge designer Thomas Harrison of Chester. He became a fellow of the RIBA in 1848 and an associate of the Institution of Civil Engineers in 1839. He was appointed Montgomeryshire County Surveyor in 1817 a post in which he continued until 1859.
He was also the surveyor for the Montgomeryshire Turnpike Trusts and was responsible for the design of many new roads in the county. He became county surveyor for Denbighshire around 1820.
1814 Married Frances Kirk, daughter of the Wrexham iron master Richard Kirk (1747–1839), and initially lived at Overton-on-Dee, but by 1823 he had moved to Oswestry, where he set up his office, known as "Penson's Chambers" at 35 Willow Street; while he lived at 19 Willow Street.
In 1839 his wife inherited from her father Gwersyllt Hall or Hill near Wrexham, which Penson re-modeled in Neo-Jacobean style, which they then used as their main residence.
Among Penson's pupils was J. W. Poundley, who was to become the Montgomeryshire County Surveyor 1861: and the Welsh poet John Jones (Talhaiarn).
Penson was Mayor of Oswestry in 1840 and was appointed Deputy Lord Lieutenant for Denbighshire in 1852.
Thomas Penson died at Gwersyllt on 20 May 1859.
Penson's work as a bridge builder in Montgomeryshire has been surveyed in detail by C. R. Anthony who lists 62 bridges built to Penson's designs in Montgomeryshire. He relied on contractors to build his bridges, such as David Davies, who built the approach roads to Llandinam Bridge in 1846.
In February 1852, the Severn flooded, damaging a number of bridges for which Penson went on to design replacements. Other bridges credited to Thomas Penson include:
1861 Obituary 
MR. THOMAS PENSON, who joined the Institution as an Associate in the year 1839, was an architect in extensive practice, and held for a long period the appointment of County Surveyor for Montgomeryshire. Up to the present time it has not been possible to obtain the materials for his Memoir; but it is hoped that they may eventually be procured for future publication.