Pwll Arthur is an inland water in St Fagans, Cardiff
- Built-Up Area: St Fagans
- Parish/Community: St. Fagans
- Unitary Authority: Cardiff
- Region: Wales
- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°29'25"N 3°16'47"W
- Eastings/Northings: 311236, 177604
- OS Grid: ST112776
- Mapcode Local: GBR HS.KCPM
- Mapcode Global: VH6F5.3SDT
Location and coordinates are for the approximate centre of Pwll Arthur within this administrative area.
Geographic features and populated places may cross administrative borders.