Joel Barlow High School is a public high school serving students in ninth through twelfth grades in Redding, Fairfield County, Connecticut, United States.

The school serves Easton and Redding students.

Each year a referendum is held on the school budget and must be passed by a majority of voters in the two towns.

[1] For the purpose of comparison with the achievement levels of similar schools, the state Department of Education classifies schools and communities in "District Reference Groups", defined as "districts whose students' families are similar in education, income, occupation and need, and that have roughly similar enrollment".

[3] Joel Barlow High School (Region 9) is one of eight school districts in District Reference Group A (others are Darien, Easton, New Canaan, Redding, Ridgefield, Westport, and Wilton).