Montmelon is a village and former municipality in the district of Porrentruy in the Canton of Jura in Switzerland .

Since January 1, 2009 it is a part of the new municipality Clos du Doubs .

The municipality was composed of several villages (Montmelon-Dessus, Montmelon-Dessous, Ravines) and of many dispersed farms. The municipality had approximately 100 inhabitants, many of whom are farmers.