Marysville High School (MHS) is a public high school in Marysville, Ohio. It is the only traditional high school in Marysville Exempted Village School District, but is accompanied by the Marysville Early College High School. MHS's school mascot is the "Monarch", which is a lion that symbolizes the "King (Monarch) of the Jungle".

Marysville is a city in and the county seat of Union County, Ohio, United States, approximately 27 miles (43 km) northwest of Columbus. The population was 25,571 at the 2020 census. It is part of the Columbus metropolitan area.