| Bwlch Mawr | |
|---|---|
 | |
| Highest point | |
| Elevation | 510 m (1,670 ft) |
| Prominence | 145 m (476 ft) |
| Parent peak | Gyrn Ddu  |
| Listing | HuMP, Sub-Marilyn |
| Coordinates | 53°00′17″N 4°20′46″W / 53.0048°N 4.3462°W |
| Naming | |
| English translation | big pass |
| Language of name | Welsh |
| Geography | |
| Location | Gwynedd, Wales |
| OS grid | SH 427478 |
| Topo map | OS Landranger 123 / Explorer 254 |
Bwlch Mawr is a hill near the northeastern corner of the Llŷn Peninsula in the community of Clynnog in the county of Gwynedd in North Wales.
Its name is an odd one for a hill, as it means "big pass" in English. It forms the eastern half of a wider upland area, the highest point of which is the 522 m summit of Gyrn Ddu, though it is Bwlch Mawr on which the Ordnance Survey constructed a trig point.