Henry Jones Underwood (1804–1852) was an English architect who spent most of his career in Oxford. He was the brother of the architects Charles Underwood (circa 1791–1883) and George Allen Underwood (dates unknown).
Underwood trained in London as a pupil of Henry Hake Seward and then joined the office of Sir Robert Smirke. In 1830 he moved to Oxford where much of his work involved designing churches or schools. He built Saint Paul's parish church, Walton Street, and the library of the Oxford Botanic Garden in the Greek Revival style but is best known for his Gothic Revival architecture. His church at Littlemore for Newman became a model for other churches.
Underwood designed an extension to Oxford Prison. In 1852 he committed suicide at the White Hart Hotel, Bath, Somerset so J. C. Buckler completed the extension in his stead.
Saint John the Baptist parish church, Summertown, Oxford, 1831 (demolished 1924)Exeter College, Oxford: buildings on Turl Street and Broad Street, 1833-34Pembroke College, Oxford: rebuilding of Wolsey's Almshouses, 1834Saint Mary and Saint Nicholas parish church, Littlemore, Oxfordshire, 1835Botanic Garden, Oxford: library, 1835Saint Paul's parish church, Walton Street, Oxford, 1836 (now Freud's bar)Saint Peter's parish church, Bushey Heath, Hertfordshire, 1836-37Parish church of the Ascension, Littleworth, Vale of White Horse, 1839All Saints' parish church, Llangorwen, 1839Holy Trinity parish church, Lower Beeding, West Sussex, 1840Holy Trinity, Burdrop (Sibford Gower), Oxfordshire, 1840Saint Giles' parish church, Horspath, Oxfordshire: rebuilt chancel, 1840Saint Mary's parish, Broughton, Oxfordshire: extension of Rectory, 1842Saint John the Baptist parish church, Bodicote, Oxfordshire: rebuilt church, 1844Saint Mary's parish church, Swerford, Oxfordshire: north aisle, 1846Saint Leonard's parish church, Woodcote, Oxfordshire: rebuilt church, 1846Littlemore Hospital, Littlemore, Oxfordshire: extension, 1847Saint Sepulchre's Cemetery, Oxford: chapel, 1848 (demolished circa 1970)Oxford Prison extension, 1848-56Christ Church Unitarian chapel, Banbury, 1850 (demolished circa 1972)Saint Giles' parish church, Horspath: north aisle and north transept, 1852His work also includes Holy Trinity Church, Oxford and the north aisle of Saint Thomas's parish church, Oxford. (date uncertain).
