Union County Regional High School District was a regional public school district that served students in ninth through twelfth grades at four high schools in Union County, New Jersey, United States. Established in 1937 as the state's first regional high school district, conflict between the constituent municipalities about school funding and grievances related to the closure of one of the four schools led to the passage of a referendum for the district's dissolution in May 1996, which took effect at the end of the 1996-97 school year. The Commissioner of the New Jersey Department of Education called Union County Regional "the highest-spending regional high school in the state".