St. Lawrence Seminary High School is a preparatory high school operated by the Province of St. Joseph of the Capuchin Order at Mount Calvary, Wisconsin. The school is in the Archdiocese of Milwaukee. It is an all-male boarding school, with approximately 225 students enrolled in grades 9 through 12. The school's mission is to prepare its male students for vocations in the Catholic Church.

The Order of Friars Minor Capuchin is a religious order of Franciscan friars within the Catholic Church, one of three "First Orders" that reformed from the Franciscan Friars Minor Observant, the other being the Conventuals (OFMConv). Franciscans reformed as Capuchins in 1525 with the purpose of regaining the original Habit (tunic) of St. Francis of Assisi and also for returning to a stricter observance of the rule established by Francis of Assisi in 1209.