Eugène Viollet-le-Duc, French architect, designed the Lausanne Cathedral (died 1879)

Eugène Emmanuel Viollet-le-Duc was a French architect and author, famous for his restoration of the most prominent medieval landmarks in France. His major restoration projects included Notre-Dame de Paris, the Basilica of Saint Denis, Mont Saint-Michel, Sainte-Chapelle, the medieval walls of the city of Carcassonne, and Château de Roquetaillade in the Bordeaux region.

The Cathedral of Notre Dame of Lausanne is a church located in the city of Lausanne, in the canton of Vaud in Switzerland. It is owned by the Evangelical Reformed Church of the Canton of Vaud.