Montgomery County R-II High School is a high school located about 1/2 mile south of Montgomery City, Missouri, on the east side of state highway 19.

It is part of the Montgomery County R-II school district.

The district serves much of Montgomery County, including the towns of Bellflower, High Hill, Jonesburg, Mineola, Montgomery City, and New Florence.

Montgomery County R-II High School is a member of the Missouri State High School Activities Association (MSHSAA) and participates in class 2A and 3A athletics.

Sports offered include football, cross country, softball, volleyball, cheerleading, basketball, baseball, and track and field.