Chavannes-sur-Moudon is a municipality in the district Broye-Vully in the canton of Vaud in Switzerland .

Chavannes-sur-Moudon is first mentioned in 1453 as Chavanes.

Chavannes-sur-Moudon has an area, as of 2009, of 5.14 square kilometers (1.98 sq mi). Of this area, 3.88 km2 (1.50 sq mi) or 75.5% is used for agricultural purposes, while 1 km2 (0.39 sq mi) or 19.5% is forested. Of the rest of the land, 0.27 km2 (0.10 sq mi) or 5.3% is settled (buildings or roads).

Of the built up area, housing and buildings made up 1.9% and transportation infrastructure made up 3.1%.