Rivière-Beaudette 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.

Autoroute 20 is a Quebec Autoroute, following the Saint Lawrence River through one of the more densely populated parts of Canada, with its central section forming the main route of the Trans-Canada Highway from the A-25 interchange to the A-85 interchange. At 585 km (363.5 mi), it is the longest Autoroute in Quebec. It is one of two main links between Montreal and Quebec City; the other is the A-40.