Armijo High School is a public secondary school located in Fairfield, California, United States. It is the oldest of the three high schools in the Fairfield-Suisun Unified School District, the other two being Fairfield High School and Angelo Rodriguez High School. It is named after the Armijo family, who purchased one of the original six land grants in Solano County awarded to General Mariano Vallejo. The school serves about 2600 students in grades 9 to 12 from the central part of Fairfield and Suisun City.