Rivière-Beaudette (French pronunciation: ​[ʁivjɛʁ bodɛt]) is a municipality of Quebec, Canada, located in the southwest corner of the Vaudreuil-Soulanges Regional County Municipality on the border with Ontario along the St. Lawrence River. The population as of the 2021 Canadian census was 2,489. The area is primarily made up of farmland with residential development along the St. Lawrence River.