Messmer High School is a private Catholic high school in Milwaukee, Wisconsin.

Messmer High School was established in 1926 as Diocesan High School.

It was renamed after Archbishop Sebastian Messmer in 1928.

[2] 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.

This Wisconsin school-related article is a stub.