| Country: | Wales |
| Welsh Name: | Abertyswg |
| Constituency Welsh Assembly: | Merthyr Tydfil and Rhymney |
| Static Image Name: | Terraced houses, Abertysswg (geograph 4010743).jpg |
| Official Name: | Abertysswg |
| Unitary Wales: | Caerphilly |
| Lieutenancy Wales: | Gwent |
| Constituency Westminster: | Blaenau Gwent and Rhymney |
| Post Town: | Tredegar |
| Postcode District: | NP22 |
| Postcode Area: | NP |
| Dial Code: | 01685 |
| Os Grid Reference: | SO131056 |
| Coordinates: | 51.7423°N -3.26°W |
Abertysswg (cy|Abertyswg) is a village in the county borough of Caerphilly, Wales, within the historic boundaries of Monmouthshire.
Situated in the South Wales Valleys, Abertysswg is a small village located to the east of Pontlottyn and south-east of Rhymney. The nearest major town is Merthyr Tydfil. The Rhymney River lies just west of the village.Abertysswg is overlooked to the south by Twyn Cornicyll above Coed Cefn Rhychdir. The village came into being in 1895-1900 through industrialisation brought by the development of Abertysswg Colliery, the first shaft of which was sunk in 1897.
The village is within the South Wales Coalfield and used to have a pit at the end of Westville, although the mine closed in 1969. Most of the village's industry is now small scale retail. Abertysswg has a village shop, Post Office, takeaway and has two clubs.
The village has had some renovation work completed on it in the new millennium. A new park/recreation area has been built, and a brand new community centre stands at the top of the village.
The Doctor Who Big Finish Productions audio drama Black Thursday is set in the village.