Montegrosso Pian Latte () is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about southwest of Genoa and about northwest of Imperia.
As of 31 December 2004, Montegrosso Pian Latte had a population of 132 and an area of .
The municipality of Montegrosso Pian Latte contains the frazione (subdivision) Case Fascei.
Montegrosso Pian Latte borders the following municipalities: Cosio di Arroscia, Mendatica, Molini di Triora, Pornassio, Rezzo, and Triora.
Montegrosso Pian Latte is twinned with: