Glantwymyn (Welsh pronunciationⓘ) is a community in the northwest (Montgomeryshire) of Powys, Wales.

It comprises the villages of Cemmaes, Commins Coch and Cemmaes Road (Welsh name Glantwymyn), as well as the smaller settlements of Abercegir, Darowen, Cwm-llinau, Tal-y-wern, Esgairgeiliog and Llanwrin.

The community had a population of 1,185 as of the 2011 UK Census, including 200 children under 16, in 527 households.

Councillors are elected from the community wards of Ceinws, Cemmaes, Darowen and Llanwrin.

[2] Glantwymyn is also the name of the electoral ward which elects a councillor to Powys County Council.