Pioneer High School is a public school in West Whittier-Los Nietos, a census-designated place in unincorporated Los Angeles County, California.

Pioneer High School encourages the taking of AP courses in order to challenge and prepare for college.

Pioneer High School offers a wide variety of AP courses, which include:

• AP Biology
• AP Calculus AB
• AP Calculus BC
• AP Chemistry
• AP English Language and Composition
• AP English Literature and Composition
• AP Environmental Science
• AP French Language
• AP Human Geography
• AP Physics C
• AP Spanish Language
• AP Spanish Literature
• AP United States Government and Politics
• AP United States History
• AP World History

Pioneer High School, home of the Titans, is located in unincorporated community of West Whittier-Los Nietos, California, neighboring the city of Pico Rivera. The school serves students from the Los Nietos, South Whittier, and Whittier City school districts. PHS is one of the 5 comprehensive high schools in the Whittier Union High School District.

The student body at pioneer is 96.4% Hispanic, 1.8% White, and less than 1% each Asian, Black, Native American and Pacific Islander. (As of 2020-2021)

• Cross country
• Football
• Tennis (girls)
• Volleyball (girls)
• Water polo (boys)

• Basketball
• Soccer - 1979 3A CIF Champs; 1978, 1979
• Wrestling -

• Baseball
• Golf
• Softball
• Swimming
• Tennis (boys)
• Track & field
• Volleyball (boys)

• Wrestling
• Baseball
• Basketball
• Cross country
• Football
• Soccer
• Tennis
• Volleyball
• Water polo

• Lauren Tewes; actress.

• Pioneer High School
• Titan Tribune, 1959-1960
• Titan Tribune, 1960-1961
• Titan Tribune, 1961-1962
• Titan Tribune, 1962-1963
• Pioneer Highschool School - Titan Memories (1963)
• President Reagan's Question-and-Answer Session With Pioneer High School Students on June 30, 1983
• 1983 CNN Report about Pioneer
• Pioneer High School Showcase (2022)