Messmer High School

Messmer High School is a private Catholic high school in Milwaukee, Wisconsin. It is located in the Archdiocese of Milwaukee.

Messmer High School was established in 1926 as Diocesan High School. It was renamed after Archbishop Sebastian Messmer in 1928.

From September 1997 to September 1998, due to a school voucher program, the number of students increased by almost 20%, to 366, and 30 students were on a wait list as of the latter month; years prior, the school did not have a waiting list.