#1 Best All-Boys Schools in Saint Louis, MO
St. Louis Priory School
Independent Catholic school · Grades 7–12
100% of graduates go to four-year colleges
Saint Louis, MO
A+Overall gradeAll boys299 students8 students per teacher
2026 lists
Best All-Boys Schools in Saint Louis, MO
The highest-graded schools of this kind in Saint Louis, MO. Top 5 of 5 schools.
#2 Best All-Boys Schools in Saint Louis, MO
St. Mary's South Side Catholic High School
Independent Catholic school · Grades 9–12
Smaller classes than 74% of Catholic schools in Missouri
Saint Louis, MO
A+Overall gradeAll boys203 students9 students per teacher
#3 Best All-Boys Schools in Saint Louis, MO
St. Louis University High School
Independent Catholic school · Grades 9–12
One of the 3 largest Catholic schools in Missouri
Saint Louis, MO
AOverall gradeAll boys1,036 students12 students per teacher
#4 Best All-Boys Schools in Saint Louis, MO
Loyola Academy of St. Louis
Independent Catholic school · Grades 4–8
Smaller classes than 80% of Catholic schools in Missouri
Saint Louis, MO
AOverall gradeAll boys77 students8 students per teacher
#5 Best All-Boys Schools in Saint Louis, MO
Chaminade College Preparatory School
Independent Catholic school · Grades 6–12
96% of graduates go to four-year colleges
Saint Louis, MO
B+Overall gradeAll boys872 students10 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.