St. John's Northwestern Military Academy (SJNMA) was founded in 1884 as St. John's Military Academy (SJMA) in Delafield, Wisconsin, by the Rev. Sidney T. Smythe as a private, college preparatory school. In 1995, Northwestern Military and Naval Academy (NMNA) in Lake Geneva, Wisconsin, merged with St. John's Military Academy to become St. John's Northwestern Military Academy on the Delafield campus. In 2020, a Leadership Academy was added and the combined schools became St. John's Northwestern Academies. SJNA (St. John's Northwestern Academies) is a coed independent boarding and day school for boys and girls in grades 6–12. St. John's Northwestern Summer Academy offers Little Lancers Day Camp, Summer Academy Plus, and ESL courses.

Historic buildings

St. John's Northwestern campus consists of a collection of historic buildings, many with towers and battlements in a style that suggests a Medieval castle, with most of them arranged in a U around the drill field. In 1977 these historic campus buildings were listed on the National Register of Historic Places for the complementary design of many of them and since the school is the oldest military academy in Wisconsin.

Notable alumni