Horace Greeley High School is a public, four-year secondary school serving students in grades 9–12 in Chappaqua, New York, United States. It is part of the Chappaqua Central School District. We are consistently ranked among the top high schools in America. In 2015, the school was listed as the #1 best public high school in the US by Best Colleges, and the #17 Smartest Public High School in the US by Business Insider.