Abertridwr (; Welsh: the mouth of the three waters) is a village in Caerphilly County Borough, Wales, situated about 3 miles (4.8 km) north-west of Caerphilly town. The "three waters" or "three streams" are Nant Cwm-parc, Nant Cwmceffyl and Nant Ilan, which join to form Nant yr Aber.[citation needed]
Like many villages and towns in the area, Abertridwr was a coal mining community within the South Wales Coalfield.