South Dayton is a village in Cattaraugus County, New York, United States.

Possibly the most famous event to occur in South Dayton is that a revelation is reported to have been received by the Mormon prophet, Joseph Smith, in the home of Freeman Nickerson on October 12, 1833, known as Section 100 of the Doctrine and Covenants.

It was also featured in the classic film, The Natural, which starred Robert Redford.

According to the United States Census Bureau, the village has a total area of 1.0 square mile (2.6 km2), all land.

The New York and Lake Erie Railroad serves the village with freight and occasional passenger rail service.

25.8% of all households were made up of individuals, and 10.9% had someone living alone who was 65 years of age or older.