Richard Gahr High School, often simply known as Gahr High School, is a public, STEAM (Science, Technology, Engineering, Art, and Math) magnet high school in Cerritos, California, serving grades 9-12.

Gahr High is one of three comprehensive high schools in the ABC Unified School District.

Gahr High School opened 60 years ago in 1965 as the first high school in both the newly unified ABC Unified School District, and the recently incorporated City of Dairy Valley (the city would be renamed to its current state two years later).

[3] The school was officially named after Richard Gahr, who had served as the school district's superintendent.

During the 1970s, as the student population in Cerritos rapidly grew, Cerritos High School was created for district expansion, and during its construction the latter used part of the Gahr campus.