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The union high school district operates nine comprehensive high schools and serves most of Glendale and a portion of Phoenix. It is the second largest high school-only district preceded by Phoenix Union.
Glendale Union High School District schools receive the graduates of the Washington Elementary School District, Glendale Elementary School District, and many students from the Madison School District. Glendale Elementary district is located in Glendale, Arizona, Madison schools are in North Central Phoenix and the Washington Elementary schools are in North Phoenix and Sunnyslope.
The GUHSD Online Learning Academy (formerly "Christown Academy" and "Metrocenter Academy"), is an alternative high school. It admits students who wish to take online courses, and it offers high school diplomas but not GEDs. In 2018–19 it had 247 students enrolled.