John Dewey High School is a public high school in Gravesend, Brooklyn, New York City. It was founded and based on the educational principles of John Dewey. The school, under the supervision of the New York City Department of Education, was named a New American High School in 2000.

Gravesend is a neighborhood in the south-central section of the New York City borough of Brooklyn, on the southwestern edge of Long Island in the U.S. state of New York. It is bounded by the Belt Parkway to the south, Bay Parkway to the west, Avenue P to the north, and Ocean Parkway to the east.