| Country: | Wales |
| Static Image Name: | File:Aberoer Institute (geograph 2346635).jpg |
| Static Image Caption: | The Aberoer Institute, a village hall. |
| Coordinates: | 53.0335°N -3.0674°W |
| Official Name: | Aberoer |
| Community Wales: | Esclusham |
| Unitary Wales: | Wrexham |
| Lieutenancy Wales: | Clwyd |
| Constituency Westminster: | Clwyd South |
| Constituency Welsh Assembly: | Clwyd South |
| Post Town: | WREXHAM |
| Postcode District: | LL14 |
| Postcode Area: | LL |
| Dial Code: | 01978 |
| Os Grid Reference: | SJ 2851 4900 |
Aberoer or Aber-oer[1] (pronounced as /cy/) is a scattered settlement in Wrexham County Borough, Wales; prior to 1974 it was in Denbighshire. It is part of the community area of Esclusham, and is situated on the rural slopes of Esclusham Mountain above Rhostyllen. The placename can be translated from the Welsh language as "[the] cold stream".
There was once a small colliery at Aberoer, working some of the lowest coals in the Middle Coal Measures, though few records remain of it.[2]