Hannibal is a town in Oswego County, New York, United States.

Much of the region was purchased from the Onondaga and Oneida tribes to form the Central New York Military Tract to pay off war veterans.

The name was provided by Robert Harpur, an employee of the New York survey, who is responsible for many of the "classical" names applied to political entities in the central part of New York.

The west town line is the border of Cayuga County.

18.6% of all households were made up of individuals, and 7.2% had someone living alone who was 65 years of age or older.