Oceanside High School is an American public secondary school located in Oceanside, California. It is part of the Oceanside Unified School District (OUSD).

OUSD on-post properties of Marine Corps Base Camp Pendleton are assigned to this high school. The San Diego Association of Governments (SANDAG) stated that the school "has been noted as an important resource for the Camp Pendleton community as it serves as the high school for many students of military families since there is no high school on base."