#1 Best Private High Schools in Nassau County, NY
Our Lady of Mercy Academy
Independent Catholic school · Grades 9–12
The only all-girls school in Syosset
Syosset, NY
A+Overall gradeAll girls195 students7 students per teacher
2026 lists
Best Private High Schools in Nassau County, NY
Private high schools in Nassau County, NY with the highest overall grades. Top 20 of 20 schools.
#2 Best Private High Schools in Nassau County, NY
Lawrence Woodmere Academy
Independent school · Grades Pre-K–12
The only independent school in Woodmere
Woodmere, NY
A+Overall grade114 students3 students per teacher
#3 Best Private High Schools in Nassau County, NY
The Waldorf School of Garden City
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Garden City, NY
A+Overall grade238 students6 students per teacher
#4 Best Private High Schools in Nassau County, NY
St. Mary's High School
Parish school · Grades 9–12
The largest Catholic school in Manhasset
Manhasset, NY
A+Overall grade329 students13 students per teacher
#5 Best Private High Schools in Nassau County, NY
Sacred Heart Academy
Diocesan school · Grades 9–12
100% of graduates go to four-year colleges
Hempstead, NY
A+Overall gradeAll girls677 students14 students per teacher
#6 Best Private High Schools in Nassau County, NY
Rambam Mesivta Maimonides HS
Jewish day school · Grades 9–12
100% of graduates go to four-year colleges
Lawrence, NY
A+Overall gradeAll boys180 students7 students per teacher
#7 Best Private High Schools in Nassau County, NY
Hebrew Academy of Five Towns & Rockaway
Jewish day school · Grades Pre-K–12
The largest Jewish school in Lawrence
Lawrence, NY
A+Overall grade1,119 students6 students per teacher
#8 Best Private High Schools in Nassau County, NY
Portledge School
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Locust Valley, NY
AOverall grade518 students8 students per teacher
#9 Best Private High Schools in Nassau County, NY
North Shore Hebrew Academy
Jewish day school · Grades Pre-K–12
The largest Jewish school in Great Neck
Great Neck, NY
A-Overall grade1,116 students6 students per teacher
#10 Best Private High Schools in Nassau County, NY
St. Dominic High School
Independent Catholic school · Grades 9–12
97% of graduates go to four-year colleges
Oyster Bay, NY
A-Overall grade280 students11 students per teacher
#11 Best Private High Schools in Nassau County, NY
Long Island Lutheran Middle & High School
Lutheran (Missouri Synod) school · Grades 6–12
94% of graduates go to four-year colleges
Glen Head, NY
A-Overall grade452 students12 students per teacher
#12 Best Private High Schools in Nassau County, NY
Schechter School of Long Island
Jewish day school · Grades K–12
Smaller classes than 94% of Jewish day schools in New York
Williston Park, NY
B+Overall grade231 students4 students per teacher
#13 Best Private High Schools in Nassau County, NY
Crescent School
Independent school · Grades K–12
100% of graduates go to four-year colleges
Hempstead, NY
B+Overall grade270 students11 students per teacher
#14 Best Private High Schools in Nassau County, NY
Davis Renov Stahler Yeshiva High School -Boys
Jewish day school · Grades 9–12
99% of graduates go to four-year colleges
Woodmere, NY
BOverall gradeAll boys387 students7 students per teacher
#15 Best Private High Schools in Nassau County, NY
Hanc - Middle & High School
Jewish day school · Grades 7–12
The only Jewish school in Uniondale
Uniondale, NY
BOverall grade422 students8 students per teacher
#16 Best Private High Schools in Nassau County, NY
Kellenberg Memorial High School
Independent Catholic school · Grades 6–12
The largest of 328 Catholic schools in New York
Uniondale, NY
BOverall grade2,692 students22 students per teacher
#17 Best Private High Schools in Nassau County, NY
Mesivta Ateres Yaakov
Jewish day school · Grades 9–12
Serving families in Lawrence since at least 2011
Lawrence, NY
BOverall gradeAll boys194 students9 students per teacher
#18 Best Private High Schools in Nassau County, NY
Stella K. Abraham H.S. for Girls
Jewish day school · Grades 9–12
91% of graduates go to four-year colleges
Hewlett, NY
B-Overall gradeAll girls354 students10 students per teacher
#19 Best Private High Schools in Nassau County, NY
Mesivta Netzach Hatorah
Jewish day school · Grades 9–12
One of 2 Jewish day schools in Woodmere
Woodmere, NY
B-Overall gradeAll boys87 students9 students per teacher
#20 Best Private High Schools in Nassau County, NY
Torah High School Long Beach
Jewish day school · Grades 9–12
The only Jewish school in Long Beach
Long Beach, NY
B-Overall gradeAll boys181 students36 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.