Ossining High School (OHS) is a comprehensive public high school located in Ossining, New York, United States, along the Hudson River in northern Westchester County, New York. Serving grades 9 through 12, it is the sole high school within the Ossining Union Free School District. The school serves the entirety of the village of Ossining, portions of the Village of Briarcliff Manor, Town of Ossining, and Town of New Castle, as well as a very small southern portion of the Town of Yorktown.