La Martyre (French pronunciation: [la maʁtiʁ]; Ar Merzer in Breton) is a commune in the Finistère department of Brittany in northwestern France.

Inhabitants of La Martyre are called in French Martyriens.

The village of La Martyre has one of the oldest parish palisades (fr), whose construction was undertaken between the 11th and 17th centuries.

In the Middle Ages, a prestigious tulle fair took place in La Martyre.

Legend has it that the father of William Shakespeare used to frequent these fairs, which no longer take place.