Marquette University High School (or MUHS) is a private, all-male, Roman Catholic school, located in Milwaukee, Wisconsin. Marquette University High School is accredited by the North Central Association of Colleges and Secondary Schools and is a member of both the National Catholic Educational Association and Jesuit Secondary Education Association.

The school was spun off from the preparatory department of Marquette University in 1907. Since then, the overwhelming majority (98%) of its students have gone on to a four-year college or university. There were 239 students in the class of 2005 and 280 in the class of '06. The class of '07 was the 150th graduating class at MUHS.