Rhandirmwyn (or Rhandir-mwyn) is a small village in the north east of Carmarthenshire, Wales.

Located in the upper Towy valley, 3 km north of Cilycwm village, it extends on both sides of the river.

The Nantymwyn Lead Mine, above the village, was in existence since Roman times, and closed in 1932.

The Pwllpriddog Oak stands nearby.

This Carmarthenshire location article is a stub.