Saint-Télesphore is a municipality located in Vaudreuil-Soulanges Regional County Municipality, Quebec. The population as of the 2021 Canadian census was 754. The municipality is situated west of Saint-Polycarpe, south of Sainte-Justine-de-Newton, north of Rivière-Baudette and east of the provincial border near North Lancaster, Ontario. The municipality is named for Pope Telesphorus, who reigned from 126 to 138 AD. In addition to the village of Saint-Télesphore itself, the municipality also includes the community of Dalhousie or Dalhousie Station along the Canadian Pacific railway.