Montappone is a "comune" (municipality) in the Province of Fermo in the Italian region Marche, located about south of Ancona and about northwest of Ascoli Piceno. It is a very important centre for hat production. As of 31 December 2004, it had a population of 1,780 and an area of .
Montappone borders the following municipalities: Falerone, Loro Piceno, Massa Fermana, Monte Vidon Corrado, Montegiorgio, Sant'Angelo in Pontano.