| Fan y Big | |
|---|---|
 Summit of Fan y Big | |
| Highest point | |
| Elevation | 716.7 m (2,351 ft) |
| Prominence | 28.5 m (94 ft) |
| Parent peak | Waun Rydd |
| Listing | Nuttall |
| Coordinates | 51°52′34″N 3°24′04″W / 51.8762°N 3.401°W |
| Naming | |
| Native name | Fan y Bîg (Welsh) |
| English translation | peak/beacon of the mountain |
| Geography | |
| Location | Powys, Wales |
| Parent range | Brecon Beacons |
| OS grid | SO036206 |
| Topo map | OS Landranger 160 |
Fan y Big (Welsh: Fan y Bîg; pronounced [van ə ˈbiːg]) is a subsidiary summit of Waun Rydd in the Brecon Beacons National Park, in southern Powys, Wales. It is 716.6 m (2,351 ft) high and is often hiked as part of the Horseshoe Walk, a traverse of the four main peaks in the Brecon Beacons.