Cardiff Bay is a water feature in Penarth, Cardiff
- Built-Up Area: Penarth
- Parish/Community: Grangetown
- Unitary Authority: Cardiff
- Region: Wales
- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°27'16"N 3°10'27"W
- Eastings/Northings: 318500, 173500
- OS Grid: ST185735
- Mapcode Local: GBR KKX.5J
- Mapcode Global: VH6FD.XPQS
Location and coordinates are for the approximate centre of Cardiff Bay within this administrative area.
Geographic features and populated places may cross administrative borders.