Bon-y-maen (until 2022 Bonymaen) is an electoral ward in the City and County of Swansea, Wales, UK.

For the purposes of elections Bon-y-maen is divided into several polling districts: Winch Wen, Pentre Dwr, Hanover Square and Pentrechwyth.

The current councillors are Mandy Evans and Paul Lloyd (both Labour Party).

The electoral ward consists of some or all of the following areas: Bon-y-maen, Cefn Hengoed, Copper Quarter, Crymlyn Bog, Morfa, Pentrechwyth, Pentre Dwr, Winch Wen, in the parliamentary constituency of Swansea East.

At a by-election an Independent candidate captured the seat from Labour and held it at the next election in 1999.