Monte Porzio is a comune (municipality) in the Province of Pesaro e Urbino in the Italian region Marche, located about 40 km west of Ancona and about 30 km southeast of Pesaro. Monte Porzio borders the following municipalities: Corinaldo, Mondavio, San Costanzo, Terre Roveresche, and Trecastelli. It is an agricultural and industrial center on the hills of the left bank of the lower Val Cesano. In the 19th century it was renowned for the production of scissors.