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Drone photo of St. Sebastian's campus
A teacher gives a lesson during class
Outstanding Faculty

Students are challenged by extraordinarily talented, devoted educators

Students work in science class.
Building Leaders

Across all academic endeavors, students are provided with opportunities to build critical thinking skills and express themselves articulately

A teacher helps a group of students
Known and Loved

Small class sizes create an intimate learning community


“Through a classical and focused curriculum, St. Sebastian’s fosters a lifelong love of learning in our students. Unusually small classes and devoted faculty provide the structure and support each student needs to succeed in this intellectually challenging environment, preparing him well for college and beyond.”

Michael Nerbonne, Assistant Headmaster

Exceptional Academic Program

St.Sebastian’s provides opportunities for students to test and exceed their boundaries in all academic endeavors.

Top five schools

Students have matriculated to in the past five years

Boston College | Harvard | Holy Cross
Providence College | Middlebury

20 AP Classes

Are offered with an average of 50 students recognized as AP Scholars each year


Opportunities are offered in Calculus, Latin and Spanish

100% of students

receive a customized schedule with students choosing their courses

Science & Technology Clubs

Extra-Curriculars like Robotics, Neuroscience Network and Harvard Medical School MEDscience Program

give students the opportunity to build upon what they learn in the classroom.


are developed in many settings including

Chapel Speaking, Debate Team and Harvard Model Congress

Preparing graduates to excel in college and beyond

Adler Prioly ’05

"Exposure to so many different activities helped me fully experience and express how to be the person that I am in different contexts. Delivering chapel speeches, taking the honor code before quizzes - all of these exercises helped me learn how to approach many different professional and life situations."

John Dean ’08

“From writing to public speaking, the school gave me a wide set of skills needed for my career and created a confidence that helps when selling the product or speaking to the press.”

Conor Haughey ’12

"Being a leader is both a challenge and a responsibility, and it is rarely easy, but St. Sebastian’s gives each of its students the tools and the power to be leaders in every way, and they carry that with them wherever they go and in whatever they do."


Our curriculum is based on a clear philosophy that students are best served by courses that enable them to explore academic subjects in great depth.

Writing program


Chapel Speaking