Cymmer (Welsh: Cymer) is a small village in Neath Port Talbot in Wales, set on a hillside in the Afan Valley near the confluence of the River Afan and the River Corrwg. In 2001, Cymmer had a population of 2,883.Cymmer can also be spelled "Cymer" with the omission of one "m". Both spellings are considered correct, however. The spelling variance is explained by "Cymmer" being the English-language version, and "Cymer" the Welsh language one.