St. Mary School

16 Harrison Ave. East Islip, NY 11730

Interested in learning more about St. Mary School? You can enjoy our virtual tour featuring our faculty, staff, and students that is available from our home page of the website. Our website also offers introductions to the teachers and curriculum at each grade level. If you have any questions or would like to schedule a tour, please feel free to contact us at (631) 581-3423, ext.142. 

St. Mary School was founded in 1914 by the School Sisters of Notre Dame.  For over one hundred years, the “charism” of that religious community, which is “unity, and educating in all we do and world vision” continues to permeate who we are.

Hopefully, you will take a few minutes to visit with us online and discover the great opportunities afforded to our students.  We pride ourselves on educating the whole child with a special emphasis on his or her religious formation in the Catholic faith.

You are always welcome to come and see our wonderful school and consider joining our great school family!


Early Childhood: Nursery, Pre-K

Elementary: K-5, Kindergarten (Full Day)

Middle: Grades 6, 7, 8