Mathern (Welsh: Matharn; older form: Merthyr Tewdrig) is a village, community, and historic parish in Monmouthshire, south east Wales, about 3 miles (4.8 km) south west of the town of Chepstow, close to the Severn Estuary, the Bristol Channel and the M48 motorway.

An authoritative local history[2] suggests that the settlement originates from a time when the St. Pierre Pill, an inlet off the Severn Estuary, was larger and much more important than now, and met an ancient ridgeway which passed through Shirenewton towards Monmouth.

[5][failed verification] The existing parish church of St. Tewdric dates largely from the late 15th century, when it was rebuilt on an earlier foundation by John Marshall, Bishop of Llandaff, in the Perpendicular architectural style.

[6] Hando recounts the story told to him by an old lady who had lived in Mathern and who claimed to have seen for herself, in 1881, the stone coffin bearing the remains of St. Tewdrig with his mortal wound (a hole in the skull made by a spear-point) still visible.

In his 1882 publication, local historian Octavius Morgan provides a description of three carved stones, showing symbols of the Holy Trinity, which once formed part of a grand gateway to the palace, but by then deposited by Lord Tredegar at the museum at Caerleon, dating from the time of Bishop John de la Zouch who held the See between 1408 and 1423.

The Vaughan-Hughes family, who occupied the house between the late 19th and mid-20th centuries, built cottages and almshouses in Mathern for their employees, some dated to 1891.

In 2005/06 the club – then known as Mathern Wanderers – won the Harry Fishwick Cup defeating Monmouth Town F.C.

Following ground improvements made during the close season, Mathern were promoted to the Gwent County League's Division Three.

Mathern's first team won a further promotion – to Division 2 of the Gwent County League after finishing runners-up to Sebastopol FC at the end of the 2013/14 season.