Coed Tre wern is a forest or wood in Pentyrch, Cardiff
- Built-Up Area: Pentyrch
- Parish/Community: Pentyrch
- Unitary Authority: Cardiff
- Region: Wales
- Category: Landcover
- Type: Forest or Wood
- Latitude/Longitude: 51°31'0"N 3°17'14"W
- Eastings/Northings: 310768, 180557
- OS Grid: ST107805
- Mapcode Local: GBR HS.HPTP
- Mapcode Global: VH6F4.Y4YG
Location and coordinates are for the approximate centre of Coed Tre wern within this administrative area.
Geographic features and populated places may cross administrative borders.