Montilliez is a municipality in the district of Gros-de-Vaud in the canton of Vaud in Switzerland.
The municipalities of Dommartin, Naz, Poliez-le-Grand and Sugnens merged on 1 July 2011 into the new municipality of Montilliez.
Dommartin is first mentioned in 908 as Domno Martino villa. Naz is first mentioned around 1200 as Nars. Poliez-le-Grand is first mentioned around 1160-79 as Poleto. In 1225 it was mentioned as Pollie lo Grant. Sugnens is first mentioned in 1177 as Sugnens.
Montilliez has an area, , of . Of this area, or 67.2% is used for agricultural purposes, while or 24.7% is forested. Of the rest of the land, or 7.0% is settled (buildings or roads).
The municipality has a railway station, , on the suburban LausanneâÂÂBercher line.
The historical population is given in the following chart: