All Saints High School may refer to:
Canada
- All Saints Catholic High School (Ontario)
- All Saints Catholic Secondary School, Whitby, Ontario
- All Saints High School (Calgary)
India
- All Saints High School (Andhra Pradesh), Hyderabad
Malaysia
- All Saints Secondary School, Kota Kinabalu, Sabah
United Kingdom
- All Saints' Catholic High School, Rawtenstall, Rawtenstall
- All Saints Catholic High School, Sheffield, South Yorkshire
- All Saints RC Secondary, Glasgow
- All Saints Catholic High School, Kirkby, Merseyside, England
United States
- All Saints High School (Detroit, Michigan)
- All Saints High School, a former high school in Washington, D.C., merged into Archbishop Carroll High School in 1989