Residents of Manhattan Beach attended Redondo Union until 1950, when Mira Costa High School opened.

[4] In 2013 RUHS Boys' Basketball defeated College Park to win the Division II CIF State Championship.

[8] In 2022 both Boys' and Girls' Soccer won the CIF Southern Section Division 2 Championships on their home stadium on the same day.

[9] In 2024 the RUHS Boys' Volleyball team won the first CIF Division II State Championship in school history when they defeated St. Margaret's 3-2.

Redondo offers Advanced Placement classes in: English Language, English Literature, Biology, Chinese, Chemistry, Environmental Science, Physics 1, Physics 2, European History, United States History, Government and Politics: United States, Psychology, Calculus AB, Calculus BC, Statistics, Studio Art, French, Spanish Language, Computer Science A, Computer Science Principles, Art History, Macroeconomics, and Music Theory.