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.

[2] Pioneer High School offers a wide variety of AP courses, which include: 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.

The student body at pioneer is 96.4% Hispanic, 1.8% White, and less than 1% each Asian, Black, Native American and Pacific Islander.