Mynydd Mawr (disambiguation)

Mynydd Mawr (Welsh for big mountain) is a mountain in North Wales.

Mynydd Mawr may also refer to:
 * Llanarmon Mynydd Mawr, an isolated rural parish in Powys, Wales
 * Llanelli and Mynydd Mawr Railway, a heritage railway aiming to re-instate the Llanelly and Mynydd Mawr Railway that closed in 1989
 * Llanelly and Mynydd Mawr Railway
 * Ras Mynydd Mawr, an annual running race from Y Fron up the hill Mynydd Mawr