Ossining is a town located along the Hudson River in Westchester County, New York. The population was 40,061 at the time of the 2020 census. It contains two villages, the Village of Ossining and part of Briarcliff Manor, the rest of which is located in the Town of Mount Pleasant. Ossining is the location of Sing Sing maximum-security prison.

The Wappinger were an Eastern Algonquian Munsee-speaking Native American people from what is now southern New York and western Connecticut.