Union High School
|Location||N. 3rd St./223 N. Fourth St., Black River Falls, Wisconsin|
|Area||0.1 acres (0.040 ha)|
|Architect||W. H. J. Nichols|
|Architectural style||Second Empire|
|NRHP reference No.||78000103|
|Added to NRHP||January 20, 1978|
The Union High School building is located in Black River Falls, Wisconsin.
The building was used as a high school until 1897. Since then, it was used as an elementary school and currently for elderly housing. It was listed on the National Register of Historic Places in 1978 and on the State Register of Historic Places in 1989.