#1 Best Private High Schools in Middlesex County, MA
Chapel Hill Chauncy Hall School
Independent school · Grades 8–12
The only independent school in Waltham
Waltham, MA
A+Overall grade198 students5 students per teacher
2026 lists
Best Private High Schools in Middlesex County, MA
Private high schools in Middlesex County, MA with the highest overall grades. Top 15 of 15 schools.
#2 Best Private High Schools in Middlesex County, MA
Groton School
Episcopal school · Grades 8–12
The only Christian school in Groton
Groton, MA
A+Overall grade381 students6 students per teacher
#3 Best Private High Schools in Middlesex County, MA
Lexington Christian Academy
Christian school (nondenominational) · Grades 6–12
The only Christian school in Lexington
Lexington, MA
A+Overall grade290 students9 students per teacher
#4 Best Private High Schools in Middlesex County, MA
Newton Country Day School
Independent Catholic school · Grades 5–12
The only all-girls school in Newton
Newton, MA
A+Overall gradeAll girls374 students5 students per teacher
#5 Best Private High Schools in Middlesex County, MA
Brimmer & May School
Independent school · Grades Pre-K–12
98% of graduates go to four-year colleges
Chestnut Hill, MA
A+Overall grade394 students6 students per teacher
#6 Best Private High Schools in Middlesex County, MA
The Rivers School
Independent school · Grades 6–12
The largest independent school in Weston
Weston, MA
A+Overall grade525 students6 students per teacher
#7 Best Private High Schools in Middlesex County, MA
Malden Catholic High School
Independent Catholic school · Grades 9–12
98% of graduates go to four-year colleges
Malden, MA
A+Overall grade863 students12 students per teacher
#8 Best Private High Schools in Middlesex County, MA
The Cambridge School of Weston
Independent school · Grades 9–12
100% of graduates go to four-year colleges
Weston, MA
A+Overall grade307 students7 students per teacher
#9 Best Private High Schools in Middlesex County, MA
Gann Academy-The New Jewish High School
Jewish day school · Grades 9–12
The only Jewish school in Waltham
Waltham, MA
AOverall grade351 students7 students per teacher
#10 Best Private High Schools in Middlesex County, MA
Academy of Notre Dame
Diocesan school · Grades Pre-K–12
100% of graduates go to four-year colleges
Tyngsboro, MA
A-Overall grade502 students11 students per teacher
#11 Best Private High Schools in Middlesex County, MA
Arlington Catholic High School/Saint Agnes School
Diocesan school · Grades Pre-K–12
98% of graduates go to four-year colleges
Arlington, MA
A-Overall grade851 students10 students per teacher
#12 Best Private High Schools in Middlesex County, MA
Lawrence Academy
Independent school · Grades 9–12
The only independent school in Groton
Groton, MA
A-Overall grade415 students7 students per teacher
#13 Best Private High Schools in Middlesex County, MA
Austin Preparatory School
Independent Catholic school · Grades 6–12
100% of graduates go to four-year colleges
Reading, MA
B+Overall grade806 students11 students per teacher
#14 Best Private High Schools in Middlesex County, MA
Cambridge High School M-Gymnasium LLD
Church of God school · Grades 1–12
Smaller classes than 80% of Christian schools in Massachusetts
Cambridge, MA
BOverall grade105 students7 students per teacher
#15 Best Private High Schools in Middlesex County, MA
Lowell Catholic
Diocesan school · Grades Pre-K–12
The largest Catholic school in Lowell
Lowell, MA
B-Overall grade705 students11 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.