| Country: | WLS |
| Type: | A |
| Route: | 4054 |
| Header Type: | minor |
| Image Notes: | Steeply rising ground alongside the A4054 near Tongwynlais |
| Length Mi: | 30.0 |
| Direction A: | South |
| Terminus A: | Llandaff |
| Direction B: | North |
| Terminus B: | Merthyr Tydfil |
| Junction: | |
| Destinations: | Cardiff |
| Previous Type: | A |
| Next Type: | A |
| Previous Route: | 4053 |
| Next Route: | 4055 |
The A4054 is an A Road connecting Llandaff, Cardiff with Merthyr Tydfil in Wales and mostly follows the former route of the A470.
Settlements served by the road include: