#1 Best Private Schools in the Diocese of Rockville Centre
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 Schools in the Diocese of Rockville Centre
Private schools in the Diocese of Rockville Centre with the highest overall grades. Top 31 of 31 schools.
#2 Best Private Schools in the Diocese of Rockville Centre
St. Brigid/Our Lady of Hope Regional School
Diocesan school · Grades Pre-K–8
The only Catholic school in Westbury
Westbury, NY
A+Overall grade182 students10 students per teacher
#3 Best Private Schools in the Diocese of Rockville Centre
St. Edward Confessor School
Parish school · Grades Pre-K–8
Smaller classes than 80% of Catholic schools in New York
Syosset, NY
A+Overall grade150 students8 students per teacher
#4 Best Private Schools in the Diocese of Rockville Centre
Our Lady of the Hamptons Regional Catholic School
Parish school · Grades Pre-K–8
The only Catholic school in Southampton
Southampton, NY
A+Overall grade291 students11 students per teacher
#5 Best Private Schools in the Diocese of Rockville Centre
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
#6 Best Private Schools in the Diocese of Rockville Centre
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
#7 Best Private Schools in the Diocese of Rockville Centre
Notre Dame School
Diocesan school · Grades Pre-K–8
Serving families in New Hyde Park since at least 2011
New Hyde Park, NY
A+Overall grade267 students12 students per teacher
#8 Best Private Schools in the Diocese of Rockville Centre
St. Aidan Upper School
Parish school · Grades 3–8
Smaller classes than 92% of Catholic schools in New York
Williston Park, NY
A+Overall grade166 students6 students per teacher
#9 Best Private Schools in the Diocese of Rockville Centre
Our Lady of Guadalupe Catholic School
Diocesan school · Grades Pre-K–8
Growing: enrollment up 47% since 2011–12
Deer Park, NY
A+Overall grade380 students12 students per teacher
#10 Best Private Schools in the Diocese of Rockville Centre
Our Lady of Victory School
Parish school · Grades Pre-K–8
Serving families in Floral Park since at least 2011
Floral Park, NY
A+Overall grade279 students13 students per teacher
#11 Best Private Schools in the Diocese of Rockville Centre
St. Rose of Lima Elementary School
Parish school · Grades Pre-K–8
Smaller classes than 64% of Catholic schools in New York
Massapequa, NY
A+Overall grade250 students10 students per teacher
#12 Best Private Schools in the Diocese of Rockville Centre
St. Martin De Porres Marianist School
Independent Catholic school · Grades Pre-K–8
One of 2 Catholic schools in Uniondale
Uniondale, NY
AOverall grade298 students12 students per teacher
#13 Best Private Schools in the Diocese of Rockville Centre
St. John the Baptist Diocesan High School
Diocesan school · Grades 9–12
100% of graduates go to four-year colleges
West Islip, NY
AOverall grade969 students15 students per teacher
#14 Best Private Schools in the Diocese of Rockville Centre
St. John Paul II Regional School
Diocesan school · Grades Pre-K–8
Smaller classes than 83% of Catholic schools in New York
Riverhead, NY
AOverall grade147 students7 students per teacher
#15 Best Private Schools in the Diocese of Rockville Centre
SS Philip & James School
Diocesan school · Grades Pre-K–8
The only Catholic school in Saint James
Saint James, NY
AOverall grade126 students10 students per teacher
#16 Best Private Schools in the Diocese of Rockville Centre
St. Anne's School
Parish school · Grades Pre-K–8
Serving families in Garden City since at least 2011
Garden City, NY
A-Overall grade323 students14 students per teacher
#17 Best Private Schools in the Diocese of Rockville Centre
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
#18 Best Private Schools in the Diocese of Rockville Centre
Trinity Regional School-East Northport Campus
Diocesan school · Grades Pre-K–8
Serving families in East Northport since at least 2011
East Northport, NY
A-Overall grade253 students12 students per teacher
#19 Best Private Schools in the Diocese of Rockville Centre
St. Patrick's School
Parish school · Grades Pre-K–8
Smaller classes than 60% of Catholic schools in New York
Huntington, NY
A-Overall grade445 students11 students per teacher
#20 Best Private Schools in the Diocese of Rockville Centre
St. Patrick School
Diocesan school · Grades Pre-K–8
Serving families in Bay Shore since at least 2011
Bay Shore, NY
A-Overall grade395 students15 students per teacher
#21 Best Private Schools in the Diocese of Rockville Centre
Holy Angels Regional School
Diocesan school · Grades Pre-K–8
A Catholic school in Patchogue
Patchogue, NY
B+Overall grade191 students12 students per teacher
#22 Best Private Schools in the Diocese of Rockville Centre
St. Anthony's High School
Parish school · Grades 9–12
The only Catholic school in Huntington Station
Huntington Station, NY
B+Overall grade2,435 students19 students per teacher
#23 Best Private Schools in the Diocese of Rockville Centre
Our Lady of Lourdes School
Diocesan school · Grades Pre-K–8
Serving families in Malverne since at least 2011
Malverne, NY
B+Overall grade226 students12 students per teacher
#24 Best Private Schools in the Diocese of Rockville Centre
St. Marys High School
Parish school · Grades 9–12
The largest Catholic school in Manhasset
Manhasset, NY
B+Overall grade329 students13 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.