Montreuil-le-Henri (French pronunciation: [mɔ̃tʁœj lə ɑ̃ʁi]) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France. It is located 35 kilometres (22 mi) south east of Mans, in the canton of Montval-sur-Loir.

Historically, it was part of the province of Maine, in the area of Haut-Maine. It had 304 inhabitants in 2019. The parish church is dedicated to Saint Anne. The Château de Montreuil-le-Henri is a Gothic building in the centre of the village, dating back to the 11th century.

In 2010, the village's climate was oceanic, as a study from the CNRS based on data covering the 1971-2000 periode. In 2020, Météo-France published a typologie of the climates of the continental France in which the commune is exposed to a altered oceanic climate and is in the climatic region of Middle Loire valley, caracterised by a good sun exposition (1850 h/year) and a summer with few of rain.

Rumors has it that the village is named this way because king Henry IV of France stayed the night.

Phạm Duy Khiêm (1908-1974), vietnamese writter and ambassador of the Republique of Viêt Nam in France, living in the vilage where he committed sucide.

• Communes of the Sarthe department