Nash (Welsh: Trefonnen) is a village and community (parish) in the southeast of the city of Newport, in the Liswerry ward.

The name is thought to originate from a contraction of "An Ash" (tree). The (Welsh name is Trefonnen meaning Town (tref) of the Ashes (Onnen).

The actual village of Nash lies a mile or two outside of the main built-up area of the city. In addition to the village itself, the parish contains Uskmouth power station and part of the Newport Wetlands Reserve. The City of Newport campus of Coleg Gwent (commonly referred to as 'Nash College') is actually in the neighbouring parish of Liswerry.

Together with the neighbouring parishes of Goldcliff and Whitson, Nash is one of the "Three Parishes" which have long been treated as a unit - geographical, socially, economically and ecclesiastically.

A large part of the village, including Farmfield House, was lost in the construction of the Uskmouth Power Station and the adjoining huge ash-pits at in 1959. A large part of the village is situated around the long wide Broadstreet Common, which may be accessed via Pye Corner or via Straits Lane. The village had its own small infant school, on West Nash Road, until the 1970s.

The church of St Mary the Virgin in West Nash, dating originally from the 12th century, is an important Grade I listed church notable for its fine tower and spire and has been called "the Cathedral of the Moors". The only remains of the Norman church is the North Wall of the Chancel and the Squint. An unusual feature, the Squint was used to enable those with leprosy, smallpox or other such diseases, to see or participate in the service without endangering the rest of the congregation. The tower is unusually located on the north side of the chancel. The interior, following restoration in 2004-2005, is notable for its complete set of 18th century furnishings, with box pews, a three-decker pulpit and a western gallery. In the fields to the south of the neighbouring Church Farm are ancient tumuli, the vestiges on some ancient, possibly mediæval, dwelling or chapel.

To the west of church the "Waterloo" public house is a tennanted free-house notable for the fact it is owned by the parish council. A modern Community Hall has now been built nearby.

At Pye Cormer the recently closed Baptist chapel, with its small burial ground, still stands in good repair. .

The Nash and Liswerry and parishes together form the Liswerry ward.

The village anjoys a regular public bus service provided by Newport Transport.