Monmouth (Welsh: Trefynwy = "town on the Monnow") is a town in south east Wales and traditional county town of the historic county of Monmouthshire. It is situated where the River Monnow meets the River Wye with bridges over both.

Monmouth boasts a medieval 13th-century stone gated bridge at Monnow Bridge, unique in Britain as it is the only preserved bridge of its design remaining. There is also a long bridge over the River Wye. After centuries of waiting a second bridge over the Monnow was finally opened on March 15, 2004, thus allowing the old bridge to become pedestrianised. This project has, however, meant the demolition of the old cattle market, thus Monmouth is no longer the traditional market town it has traditionally been; however, a farmers' market selling local produce is still held.

The annual Monmouth Show has been held each year (traditionally on the last Thursday of August) since 1919 (when it was called the Monmouthshire County Show), though its history can be traced back further to 30 May 1857 when the eighth Duke of Beaufort and Sir Charles Morgan M.P. put up the funds for a Monmouth Cattle Show, and even prior to that there had been an agricultural society in existence in the town dating back to the 1790s, which held ploughing competitions.

The Savoy Theatre in Church Street, built on the site of the oldest theatre in Wales, functions as both a cinema and theatre. There are numerous pubs in the centre of Monmouth, including Old Nags Head, Queen's Head, Punch House, The Griffin, The Gloucester, The Vinetree, The Kings Head, The Three Horseshoes, The Green Dragon and The Gatehouse.

Archaeological excavations undertaken by the Monmouth Archaeological Society on various sites along Monnow Street have uncovered a wealth of information about the early history of the town. Indeed, the Council for British Archaeology have designated Monmouth as one of the top ten towns in Britain for archaeology.

Monmouth as an organised settlement dates back to the times of the Roman occupation of Britain. The Romans called it Blestium, and it was part of a network of Roman forts covering the region, linked to Abergavenny or Gobannium, Usk known as Burrium, later Caerleon, and Gloucester and modern local archaeologists and historians have found items of Roman pottery and coinage that date from that period.