Château Saint-Maire (Saint-Maire Castle) is a castle in Lausanne, Switzerland, that serves as the seat of the cantonal government, the Council of State of Vaud.

[1] The château was built from 1397 to 1425 by the Bishops of Lausanne to serve as their fortified residence.

The windows that form a row just below the eaves fill the gaps between the merlons, and the arches above the windows fill the v-shaped openings in the Ghibelline style of merlon.

[2] In 1789, the Bernese built an annex on the west side of the castle, through which it is now entered.

A tower that formerly stood next to the château was demolished in 1890, and around the same time, a statue of Abraham Davel was installed against the front wall.