Eureka High School or EHS, formerly Eureka Senior High School, is a public high school in Eureka, California. EHS is the only regular public high school serving the City of Eureka and all of its contiguous unincorporated neighborhoods, several adjacent unincorporated communities, and related independent elementary school districts, which, altogether, comprise the Eureka Unified High School District. Administrated as part of Eureka City Schools, it is the largest high school in Humboldt County.