| Boulogne | |
| Pushpin Map: | France#France Pays de la Loire |
| Subdivision Type1: | Country |
| Subdivision Name1: | France |
| Mouth: | Lac de Grand-Lieu |
| Progression: | Lac de Grand-Lieu→ Acheneau→ |
The river Boulogne (pronounced as /fr/) is located in western France in the départements Loire-Atlantique and Vendée.
It is in length and flows north from the source near Saint-Martin-des-Noyers, through Les Essarts and La Merlatière, then through Boulogne, Vendée and Les Lucs-sur-Boulogne into the Lac de Grand-Lieu. This lake is drained by the river Acheneau towards the Loire.