Thierrens was a municipality in Gros-de-Vaud in the canton of Vaud in Switzerland. On 1 January 2013 the former municipalities of Chanéaz, Chapelle-sur-Moudon, Correvon, Denezy, Martherenges, Neyruz-sur-Moudon, Peyres-Possens, Saint-Cierges and Thierrens joined together to become one new municipality called Montanaire.