Smithfield is a town in Madison County, New York, United States.

The town is named after Peter Smith, an original land owner.

At 7:02 p.m. on July 8, 2014, Smithfield was struck by an EF2 tornado with peak estimated winds of 135 mph (217 km/h).

A three-story house was rolled off its foundation down a hill, and the occupant inside was killed.

Cowaselon Creek, a separate tributary of Oneida Lake, drains the northeastern part of the town.

16.9% of all households were made up of individuals, and 5.5% had someone living alone who was 65 years of age or older.