Viaduc de la Chocolatière, Highway bridge in Lausanne, canton Vaud, Switzerland.

The Viaduc de la Chocolatière is a 434.3 m double motorway viaduct on the A9 in Lausanne, formed of two parallel decks separated by 56 cm. Each deck comprises a 27 m beam span, a 120 m reinforced-concrete arch carrying a 163 m deck, and three beam spans of 87, 72 and 75.5 m. The pale grey arches spring from exposed molasse.

The bridge was built in two separate phases, with the right structure opening for a national exhibition in 1964 and the left structure completed nine years later. This staged expansion allowed the infrastructure to grow with regional traffic demands.

The name comes from the lieu-dit La Chocolatière on the west side of the bridge, where Charles-Amédée Kohler bought the communal sawmill of Sauvabelin in 1849 and set up one of Switzerland's first chocolate factories. It ran for about fifty years until production moved to Échandens in 1896. Kohler's factory also gave its name to a path through the Sauvabelin woods.

The bridge is located on the A9 motorway between two highway junctions and can be viewed from various points in the surrounding area. For those wanting to see the structure more closely, the valley floor provides the most accessible viewing angles.

During construction, engineers developed a specialized steel reinforcement technique to improve the bond between steel and concrete, an unusual approach for its time. This innovation demonstrates the forward-thinking methods applied to the project.