| Plas Machen | |
|---|---|
 Distant view of the house from the Rhymney River circular walk | |
| Type | House |
| Location | Lower Machen, Newport, Wales |
| Coordinates | 51°34′53″N 3°06′21″W / 51.5815°N 3.1059°W |
| Built | 16th century, with earlier and later parts |
| Architectural style(s) | Elizabethan |
Listed Building – Grade II* | |
| Official name | Plas Machen |
| Designated | 3 March 1952 |
| Reference no. | 2905 |
| Official name | Plas Machen Garden |
| Designated | 1 February 2022 |
| Reference no. | PGW(Gt)33(NPT) |
Listed Building – Grade II | |
| Official name | Nos. 1 & 2 Plas Cottages |
| Designated | 18 January 1984 |
| Reference no. | 3070 |
  Location of Plas Machen in Newport | |
Plas Machen is a country house in the hamlet of Lower Machen, to the west of the city of Newport, Wales. The house was the ancestral home of the Morgan family of South Wales prior to their construction of Tredegar House. It is a Grade II* listed building. The gardens are listed at Grade II on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales. A pair of cottages in the grounds of the house are also listed at Grade II. The house remains a private residence and is not open to the public.