Walter G. O'Connell Copiague High School

Walter G. O'Connell Copiague High School is an American four-year college preparatory public high school in the hamlet of Copiague in Suffolk County, New York. Commonly referred to as "Copiague High School," the school is named after its founder and first principal Walter G. O'Connell. It is a part of the Copiague Union Free School District.

Walter G. O'Connell Copiague High School serves approximately 1,545 students in grades nine through twelve.

The school district which operates this school is in the Town of Babylon, and includes most of Copiague, the eastern portion of North Amityville, and small portions of East Farmingdale and North Lindenhurst.