Montmollin is a former municipality in the district of Val-de-Ruz in the Canton of Neuchâtel in Switzerland .

The municipalities of Boudevilliers , Cernier , Chézard-Saint-Martin , Coffrane, Dombresson , Engollon , Fenin-Vilars-Saules , Fontainemelon , Fontaines, Les Geneveys-sur-Coffrane , Les Hauts-Geneveys , Montmollin, Le Pâquier, Savagnier and Villiers merged on 1 January 2013 into the new municipality of Val-de-Ruz.

Montmollin is first mentioned in 1347 as Mommolens. In 1372, it was mentioned as Montmolens.

Montmollin had an area, as of 2009, of 4.1 square kilometers (1.6 sq mi). Of this area, 2.33 km2 (0.90 sq mi) or 57.4% is used for agricultural purposes, while 1.45 km2 (0.56 sq mi) or 35.7% is forested.