The Ontario-Montclair School District, founded in 1884, serves a 26 square mile area which covers most of the city of Ontario, Montclair, portions of Upland, and unincorporated areas of San Bernardino County.  The District is the third largest elementary district in the State.

More than 21,800 PreK-8 students attend 26 elementary schools, 6 middle schools, and 2 alternative programs. Included in the 34 schools are magnet and academy programs, each of which is uniquely designed to provide an option for students to become fully immersed in an enhanced specially designed course of study, and two alternative programs.

OMSD boasts two California Distinguished Schools, eleven Gold Ribbon Schools, International Baccalaureate Schools, a GATE Magnet, a Science Magnet, a Dual Language Academy, and Arts-integrated Magnet, and many AVID Schools, as well as many other recognized programs.

Its Mission Statement: Ontario‐Montclair School District (OMSD) is committed to providing a world‐class education to its students in safe, respectful, and welcoming school environments that empowers students, staff, and families to be successful in a dynamic global society and cultivates college, career, and community partnerships.