Eureka High School is a public secondary school in Eureka, Illinois, United States. The school is part of Eureka Community Unit District 140, with admission based primarily on the locations of students' homes. Communities supported include Eureka, Goodfield, Secor, and Congerville. Serving students in grades ninth grade–twelfth grade, it is a small high school with a student base of 504 students. The school is a member of the Heart of Illinois Conference and competes under the name Hornets.