Ontario High School is a public high school located in Ontario, Oregon, United States.

It is a part of Ontario School District 8C.

[4] In 2015, the Four Rivers Community School charter school, originally serving students from kindergarten to eighth grade, put forth a proposal to secure a grant from the Oregon Department of Education with the intention of establishing a dual English-Spanish literacy program and offering high-level Spanish courses to Four Rivers graduates at Ontario High School.

However, in December of the same year, Four Rivers altered its plans and instead made a proposal to establish its own high school.

[3] The Ontario Tigers are part of the Greater Oregon League.