The Canton of Fontaine-le-Dun is a former canton situated in the Seine-Maritime département and in the Haute-Normandie region of northern France.

It was disbanded following the French canton reorganisation which came into effect in March 2015.

It consisted of 16 communes,[1] which joined the canton of Saint-Valery-en-Caux in 2015.

[1] A farming area in the arrondissement of Dieppe, centred on the town of Fontaine-le-Dun.

The canton comprised 16 communes:[1]