El Dorado High School is a 9th–12th grade public high school located in Placentia, California. Established in 1966, El Dorado is one of four high schools in the Placentia-Yorba Linda Unified School District, and serves the northern parts of Placentia, and Yorba Linda far eastern Fullerton, (east of the 57 freeway), and a small portion of Brea. The EDHS campus is located at 1651 Valencia Avenue, approximately 29 miles from downtown Los Angeles and 18 miles from the California coastline.

The school currently has an enrollment of over 2,400 students. The school's first graduating class was the class of 1969. The campus received a major renovation in 2002. The EDHS gymnasium is dedicated to Joe Raya, a former Athletics department staff member. The theatre is dedicated to Mrs. Gai Jones, who directed the theatre department from 1967 to 2002. The tennis courts are dedicated to Coach John H Cyrus III, who was teaching and coaching there until 2018.

In 2004, Athletic director Sally Reclusado was selected as the CIF Southern Section Athletic Director of the Year. Librarian Linda Birtler was awarded the Orange County Department of Education's Outstanding Contribution to Education Award. El Dorado has also won the prestigious Blue Ribbon Award.

The school is home to the El Dorado Golden Hawks Marching Band; the band's past achievements include a performance in the Sydney Olympics Opening Ceremony, the Tournament of Roses Parade and top honors in two trips to the Hawaii International Competition.