| Aghla Beg | |
| Other Name: | Eachla Beag |
| Elevation M: | 603 |
| Listing: | Marilyn |
| Translation: | small look-out |
| Language: | Irish |
| Location: | County Donegal, Ireland |
| Range: | Seven Sisters |
| Map: | Ireland |
| Label Position: | right |
| Map Size: | 240 |
| Coordinates: | 55.0687°N -8.0556°W |
| Grid Ref Ireland: | B965246 |
| Topo: | OSi Discovery 2 |
Aghla Beg (Irish: Eachla Beag) is a mountain in County Donegal, Ireland. Of its two summits, one has a height of, and the other, Aghla Beg South Top .
The mountain is the third-most northern and fifth-highest of the mountain chain, called the Seven Sisters by locals: Muckish, Crocknalaragagh, Aghla Beg, Ardloughnabrackbaddy, Aghla More, Mackoght (also known as 'little Errigal') and Errigal. The Seven Sisters are part of the Derryveagh Mountains.