Union High School (Modoc) is a small high school located in Union Township, Modoc, Indiana.

However, the official name is Union Junior and High School.

It is one of five high schools in Randolph County, Indiana.

For the first five years, students attended the old Modoc High School.

In 1968 an addition was completed allowing Blountsville School, which housed grades 1-8, to be closed and consolidated with Union.