Saint-Martin-des-Champs (French pronunciation: [sɛ̃ maʁtɛ̃ de ʃɑ̃] ⓘ; Breton: Sant-Martin-war-ar-Maez) is a commune in the Finistère department of Brittany in north-western France.

Since 2014 the mayor has been François Hamon, who was reelected in 2020.

[1] Inhabitants of Saint-Martin-des-Champs are called in French Saint-Martinois.

The municipality launched a language scheme for the Breton language through Ya d'ar brezhoneg on 27 October 2005.

This Finistère geographical article is a stub.