Hermenches is a municipality in the district Broye-Vully in the canton of Vaud in Switzerland .

Hermenches is first mentioned in 1254 as Ermenges.

Hermenches has an area, as of 2009, of 4.77 square kilometers (1.84 sq mi). Of this area, 3.1 km2 (1.2 sq mi) or 65.0% is used for agricultural purposes, while 1.37 km2 (0.53 sq mi) or 28.7% is forested. Of the rest of the land, 0.3 km2 (0.12 sq mi) or 6.3% is settled (buildings or roads).

Of the built up area, housing and buildings made up 3.6% and transportation infrastructure made up 2.5%.