Vaudreuil-Dorion (French pronunciation: [vodʁœj dɔʁjɔ̃]) is a suburb of Greater Montreal, in the Montérégie region of southwestern Quebec, Canada.

Vaudreuil-Dorion is located on the south shores of the Lake of Two Mountains at the confluence of the Saint Lawrence and Ottawa Rivers, just off the western edge of Île Perrot.

The city consists of two non-contiguous parts: its eastern part is the larger main area along Lake of Two Mountains where the population centres of Vaudreuil and Dorion are located; the western portion is a smaller rural area that borders Rigaud, and is separated from the eastern portion by Saint-Lazare and Hudson.

[5] Vaudreuil-Dorion forms part of the federal electoral district of Vaudreuil—Soulanges and has been represented by Peter Schiefke of the Liberal Party since 2015.

Local bus service is operated by Exo La Presqu'Île, connecting to the Vaudreuil and Dorion stations on the Vaudreuil-Hudson commuter rail line.