| Arenig Fawr South Top | |
| Elevation M: | 835 |
| Prominence M: | 21 |
| Parent Peak: | Arenig Fawr |
| Listing: | Nuttall |
| Translation: | Great High Ground |
| Language: | Welsh |
| Pronunciation: | in Welsh aˈrɛnɪɡ ˈvaur/ |
| Location: | Gwynedd, Wales |
| Range: | Snowdonia |
| Grid Ref Uk: | SH 82676 36668 |
| Topo: | OS Landranger 124 |
Arenig Fawr South Top is the twin top of Arenig Fawr in southern Snowdonia, North Wales. It is the second highest member of the Arenig range, being 18 m less than its twin. From here the south ridge continues into an area of rocky knolls and small tarns, where Arenig Fawr South Ridge Top can be found.[1]