Lower Brynamman is an electoral ward of Neath Port Talbot county borough in Brynamman, Wales.

The electoral ward of Lower Brynamman forms part of the parish of Gwaun-Cae-Gurwen.

The ward consists of some or all of the settlements of Gwaun-Cae-Gurwen, Lower Brynamman and Tairgwaith in the parliamentary constituency of Neath.

It is bounded by the wards of Quarter Bach of Carmarthenshire to the north, Cwmllynfell to the south east, and Gwaun-Cae-Gurwen to the south west.

In the May 2017 Neath Port Talbot County Borough Council election, the results were: In the 2012 local council elections, Arwyn Woolcock of the Labour Party was returned unopposed.