Acorn High School is a public high school serving students in grades 6 through 12 that is located in Acorn, an unincorporated area in Polk County, Arkansas, United States, near Mena. Acorn High School is one of four public high schools located in Polk County and one of two high schools administered by the Ouachita River School District. In 2012, Acorn High School was nationally recognized as a U.S. Department of Education Green Ribbon School (ED-GRS). The school's athletic teams have won ten state championships. In addition to Acorn, the school serves a small section of the City of Mena.