Mt. St. Mary's College Namagunga is an all-girl boarding secondary school located in Mukono District in Uganda. The school is affiliated with the Roman Catholic Diocese of Lugazi.

The college was founded in February 1942 by Mother Mary Kevin of the Franciscan Sisters for Africa. It is among the best schools academically in Uganda at both the ordinary level ("O" Level), and at the advanced level ("A" Level), or high school.