Fort-Mahon-Plage (French pronunciation: [fɔʁ ma.ɔ̃ plaʒ]) is a commune in the Somme department in Hauts-de-France in northern France.

The commune is situated on the coast of the English Channel and endowed with a sandy beach and massive sand dunes, Fort-Mahon-Plage attracts many tourists, especially during the summer and at the weekends.

Considered rather cold and wild, this part of the coast would have welcomed only fishermen and shellfish gatherers.

Fort-Mahon-Plage was not considered a commune at all until 1922, when it was officially identified as a separate village from its neighbour Quend.

The huge beach later became famous for its water activities, most notably landyacht racing, wind-surfing and kiting.