Poly Prep Country Day School (commonly known as Poly Prep) is an independent, co-educational day school with two campuses in Brooklyn, New York, United States. The Middle School (5th to 8th grades) and Upper School (9th to 12th grades) are located in the Dyker Heights section of Brooklyn, while the Lower School (nursery to 4th grade) is located in Brooklyn's Park Slope neighborhood. Initially founded as part of the Brooklyn Collegiate and Polytechnic Institute (predecessor of the NYU Tandon School of Engineering), Poly Prep now offers classes from nursery school through 12th grade.