Regional Science High School III (more commonly known as RSHS III) is a science high school located in East Kalayaan, Subic Bay Freeport Zone, Olongapo City, Zambales province of the Philippines. Established in 1994, the school implements a specialized science and mathematics-oriented curriculum, mainly for academically strong adolescents. RSHS III houses a junior high school and a STEM strand focused senior high school. Most of the student body are residents of nearby cities & provinces, majority of whom are from Olongapo City, Bataan and Zambales.