Johnstown-Monroe High School is a public high school in Johnstown, Ohio. It is the only high school in the Johnstown-Monroe Local School District. 

It was erected in 1963 (Although a new High School will take it's place in 2017) and currently houses grades 9-12. 

The current principal is Mr. Derick Busenburg. The district superintendent is Mr. Dale Dickson.

The school prides itself on its state academic "Excellent" ratings, and its high rate of student extracurricular participation. Roughly 85% the school population participate in sports and marching band.