| Official Name: | Bon-y-maen Ward |
| Static Image Name: | Wm swansea bonymaen.jpg |
| Static Image Width: | 240px |
| Unitary Wales: | Swansea |
| Lieutenancy Wales: | West Glamorgan |
| Country: | Wales |
| Constituency Westminster: | Swansea East |
| Constituency Welsh Assembly: | Swansea East |
| Councillor1: | Paul Lloyd |
| Party1: | Labour |
| Councillor2: | Mandy Evans |
| Party2: | Labour |
| Population: | 6,857 |
| Population Ref: | (2011 census) |
| Area Total Km2: | 8.47 |
| Hide Services: | yes |
Bon-y-maen (until 2022 Bonymaen) is the name of an electoral ward in the City and County of Swansea, Wales, UK.
The ward is bounded by Neath Port Talbot county borough to the east and the Swansea wards of Llansamlet and Morriston to the north; St. Thomas to the south; and Landore to the west.
For the purposes of elections Bon-y-maen is divided into several polling districts: Winch Wen, Pentre Dwr, Hanover Square and Pentrechwyth. Bon-y-maen returns 2 councillors to the local council. 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.
The first election to the new unitary City and County of Swansea Council took place in 1995. Both seats were won by Labour.