Mount St. Mary Academy is a private, Roman Catholic, all-girls high school, serving grades 9 through 12, in the Hillcrest neighborhood of Little Rock, Arkansas, United States.

[2] Mount St. Mary Academy was founded by the Sisters of Mercy in 1851 at Seventh and Louisiana Streets in downtown Little Rock.

[3] Mount St. Mary Academy students complete a curriculum that is aligned with the Smart Core curriculum developed by the Arkansas Department of Education (ADE), which requires 22 units to graduate; the typical Mount St. Mary student completes 28 units in regular and honor coursework and exams.

The Mount St. Mary Belles compete in the state's largest classification, administered by the Arkansas Activities Association.

Interscholastic activities include: basketball, bowling, cross country running, golf, soccer, softball, swimming and diving, track and field, and volleyball.