The Church of St Thomas the Martyr at Overmonnow, Monmouth, south east Wales, is located beside the medieval Monnow Bridge across the River Monnow. At least part of the building dates from around 1180, and it has a fine 12th-century Norman chancel arch, though the exterior was largely rebuilt in the early 19th century. It is one of 24 buildings on the Monmouth Heritage Trail and is a Grade II* listed building.

Thomas Henry Wyatt was an Anglo-Irish architect. He had a prolific and distinguished career, being elected President of the Royal Institute of British Architects 1870–73 and being awarded its Royal Gold Medal for Architecture in 1873. His reputation during his lifetime was largely as a safe establishment figure, and critical assessment has been less favourable more recently, particularly in comparison with his younger brother, the better known Matthew Digby Wyatt.