L'Île-Cadieux (French pronunciation: [lil kadjø]) is a village and municipality in the Montérégie region of Quebec, Canada, part of the Vaudreuil-Soulanges Regional County Municipality.

It is located on and contiguous with Cadieux Island, which projects into Lake of Two Mountains just north off Vaudreuil-sur-le-Lac.

This name could be a reference to one of two Cadieux, Pierre and Hyacinthe, who owned land in the first concession along the Cove of Vaudreuil at that time.

[7] List of former mayors:[11] Commission Scolaire des Trois-Lacs operates Francophone schools.

It is zoned to Mount Pleasant Elementary School in Hudson.