Moudon (French: [mudɔ̃]; Latin: Minnodunum; German: Milden) is a municipality in the canton of Vaud in Switzerland. It was the seat of Moudon District and is now in the Broye-Vully District .

Montmagny was known as Minnodunum or Minnidunum during the Roman era. Around 1100, 1154 and 1180 it was mentioned as Meldun, in 1161 it was Moudon and in 1167 as Meldunum or Mildunum.

As ancient Minnodunum, during Roman times, the city was in the country of the Helvetii, on a road from Viviscus (modern Vevey), on the Lake of Geneva , to Aventicum (modern Avenches ).

Moudon has an area, as of 2009, of 15.69 square kilometers (6.06 sq mi).