#1 Best Private Middle Schools in Ontario, CA
San Antonio Christian School
Seventh-day Adventist school · Grades K–8
Serving families in Ontario since at least 2011
Ontario, CA
B+Overall grade60 students15 students per teacher
2026 lists
Best Private Middle Schools in Ontario, CA
Private schools in Ontario, CA with middle-school grades and the highest overall grades. Top 5 of 5 schools.
#2 Best Private Middle Schools in Ontario, CA
Montecito Baptist School
Baptist school · Grades K–12
The smallest classes of any Christian school in Ontario
Ontario, CA
B+Overall grade96 students11 students per teacher
#3 Best Private Middle Schools in Ontario, CA
Ontario Christian School
Christian school (nondenominational) · Grades Pre-K–12
One of the 3 largest Christian schools in California
Ontario, CA
B+Overall grade1,438 students17 students per teacher
#4 Best Private Middle Schools in Ontario, CA
Orion International Academy
Independent school · Grades K–12
100% of graduates go to four-year colleges
Ontario, CA
BOverall grade112 students10 students per teacher
#5 Best Private Middle Schools in Ontario, CA
St. George Parish School
Parish school · Grades K–8
The only Catholic school in Ontario
Ontario, CA
BOverall grade316 students22 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.