Plomodiern (French pronunciation: [plɔmɔdjɛʁn]; Breton: Ploudiern) is a commune in the Finistère department of Brittany in north-western France.

The average annual rainfall is 1,117.8 mm (44.01 in) with December as the wettest month.

The temperatures are highest on average in July, at around 17.8 °C (64.0 °F), and lowest in February, at around 6.9 °C (44.4 °F).

Inhabitants of Plomodiern are called in French Plomodiernois.

This Finistère geographical article is a stub.