| Errisbeg | |
| Other Name: | Iorras Beag |
| Elevation M: | 300[1] |
| Prominence M: | 300 |
| Listing: | Marilyn |
| Language: | Irish |
| Location: | Roundstone, Connemara |
| Map: | Ireland |
| Label Position: | right |
| Map Size: | 200 |
| Coordinates: | 53.4°N -9.95°W |
| Topo: | OSi Discovery 44 |
| Grid Ref Ireland: | L697401 |
Errisbeg Mountain or Errisbeg is a hill in Roundstone, County Galway, in the West of Ireland, with a height of 300 m.
The summit has views of both the Roundstone bog and the Atlantic. On a clear day the Aran Islands are visible to the south and Clifden and the Twelve Bens to the North.