Our Lady of Mercy Academy
Independent Catholic school · Grades 9–12
Syosset, NY
815 Convent Rd, Syosset, NY 11791
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A+Class size
- ACollege-going
- B+Years serving families
- ADiversity
What stands out
- The only all-girls school in Syosset
- Smaller classes than 91% of Catholic schools in New York
- 100% of graduates go to four-year colleges
- Serving families in Syosset since at least 2011
Our Lady of Mercy Academy is an independent Catholic school in Syosset, New York, for students from 9th grade through 12th grade. It has about 195 students and around 7 students per teacher, smaller classes than 91% of Catholic high schools in New York. The school is an all-girls school and is part of the Diocese of Rockville Centre. The school reports that about 100% of its graduates go on to four-year colleges. Students attend about 7 hours a day, 180 days a year.
At a glance
- Grades
- Grades 9–12
- Students
- 195
- Teachers
- 27.5 (full-time equivalent)
- Students per teacher
- 7.1
- Boys and girls
- All girls
- Religious affiliation
- Catholic · Independent Catholic school
- Diocese
- Diocese of Rockville Centre
- School day
- About 7 hours
- School year
- 180 days
- Graduates going to 4-year colleges
- About 100% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Smaller classes than 91% of Catholic high schools in New York (7 students per teacher).
- A smaller school: fewer students than 83% of Catholic high schools in New York.
- Compared with 64 Catholic high schools in New York.
Students by survey year
Total students reported in official records since 2011–12.
Students by grade
Student body
Member of
- National Coalition of Girls' Schools
Questions to ask on a tour
- What is tuition, and what does it include (books, fees, uniforms, trips)?
- Do you offer financial aid, sibling discounts or payment plans?
- Do you accept ESA, voucher or tax-credit scholarship funds?
- How big are classes in my child's grade?
- What support is there for students who need extra help or more challenge?
- Is the school accredited, and by whom?
- What do a typical day and a typical week look like?
- How does the school communicate with families?
Questions about Our Lady of Mercy Academy
What grades does Our Lady of Mercy Academy serve?
Our Lady of Mercy Academy serves grades 9–12.
How many students attend Our Lady of Mercy Academy?
About 195 students, with 7 students per teacher, according to official records.
How much is tuition at Our Lady of Mercy Academy?
Call the school to ask about tuition, financial aid and payment plans.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
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