Marigny-le-Lozon () is a commune in the department of Manche, northwestern France. The municipality was established on 1 January 2016 through the merger of the former communes of Marigny and Lozon.
The annual Duo Normand cycling time trial starts and finishes from Marigny.
Population data refer to the area corresponding with the commune as of January 2025.
Marigny-le-Lozon currently has one sister city: