Abertysswg (Welsh: 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 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.

The Doctor Who Big Finish Productions audio drama Black Thursday is set in the village.