Fairfield High School may refer to:

Australia

• Fairfield High School (New South Wales), Australia

United Kingdom

• Fairfield High School, Bristol, in Bristol, England
• Fairfield High School, Peterchurch, in Herefordshire, England
• Fairfield High School for Girls, in Droylsden, Manchester, England
• Fairfield High School, Widnes, in Cheshire, England

United States

• Fairfield High Preparatory School, in Fairfield, Alabama
• Fairfield High School (California), in Fairfield, California
• Fairfield Community High School, in Fairfield, Illinois
• Fairfield Junior-Senior High School, in Goshen, Indiana
• Fairfield High School (Iowa), in Fairfield, Iowa
• Fairfield High School (Kansas), in Langdon, Kansas; see Fairfield USD 310
• Fairfield High School (Montana), in Fairfield, Montana
• Fairfield High School (Leesburg, Ohio)
• Fairfield High School (Fairfield, Ohio)
• Fairfield High School (Texas), in Fairfield, Texas
• Fairfield Christian Academy, in Lancaster, Ohio)
• Fairfield Union High School, in Lancaster, Ohio
• Fairfield Warde High School, in Fairfield, Connecticut (renamed from Fairfield HS in 2005)
• Fairfield Ludlowe High School, in Fairfield, Connecticut, split off from Fairfield Warde