Mountain Ash East is a community and coterminous electoral ward in Rhondda Cynon Taf, Wales.

It primarily includes the part of the town of Mountain Ash east of the River Cynon.

[3] Mountain Ash East includes the village's Grade II listed St Margaret's Church, designed by John Pollard Seddon.

[7] Cllr Jarman had been leader of the Plaid Cymru group on Rhondda Cynon Taff Council since 1996.

[7] The Plaid Cymru numbers doubled to 18 after the May 2017 election and were the official opposition on the council.