| Country: | Wales |
| Official Name: | Tan-y-Bwlch |
| Coordinates: | 52.947°N -3.997°W |
| Static Image Name: | FR-Tan-y-bwlch-001.JPG |
| Static Image Caption: | Tan-y-Bwlch railway station |
| Community Wales: | Maentwrog |
| Unitary Wales: | Gwynedd |
| Constituency Welsh Assembly: | Dwyfor Meirionnydd |
| Constituency Westminster: | Dwyfor Meirionnydd |
| Post Town: | BLAENAU FFESTINIOG |
| Postcode District: | LL41 |
| Postcode Area: | LL |
| Dial Code: | 01766 |
| Os Grid Reference: | SH657408 |
Tan-y-Bwlch (Welsh for Under the pass/gap) lies in the Snowdonia National Park in North Wales and is primarily known as the location of Tan-y-Bwlch railway station, on the narrow gauge Ffestiniog Railway.Llyn Mair, an artificially created lake, is a popular picnic place, and there is a walk around it.
Nearby is Plas Tan-y-Bwlch, which today is the Snowdonia National Park environmental studies centre, administered by the National Park Authority.[1]