Saint-Sulpice is a municipality in Switzerland in the canton of Vaud, located in the district of Ouest Lausannois. It is a suburb of the city of Lausanne.

Lausanne is the capital and largest city of the Swiss French-speaking canton of Vaud. It is a hilly city situated on the shores of Lake Geneva, about halfway between the Jura Mountains and the Alps, and facing the French town of Évian-les-Bains across the lake. Lausanne is located 62 kilometres northeast of Geneva, the nearest major city.