Northwestern Preparatory School
- For the California military school, see Northwestern Preparatory School (California).
Northwestern Preparatory School was a four-year Lutheran high school founded in 1865 and located in Watertown, Wisconsin. The school merged with Martin Luther Preparatory School in 1995 to become Luther Preparatory School. It was affiliated with Northwestern College of Watertown, which merged with Dr. Martin Luther College of New Ulm, Minnesota in 1995 to become Martin Luther College.
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