Martinengo (Bergamasque: Martinèngh) is a comune (municipality) in the Province of Bergamo in the Italian region of Lombardy, located about 50 km east of Milan and about 15 km southeast of Bergamo. As of 31 December 2004, it had a population of 9,138 and an area of 21.7 km2. The municipality of Martinengo contains the frazione (subdivision) Cortenuova di Sopra. Martinengo borders the municipalities of Cividate al Piano, Cologno al Serio, Cortenuova, Ghisalba, Morengo, Mornico al Serio, Palosco, and Romano di Lombardia. The municipality is home to the mother house of the Congregation of the Holy Family of Bergamo.

Demographic evolution