Bethany is a town in Genesee County, New York, United States.

The town lies on the southern border of Genesee County.

According to the United States Census Bureau, the town has a total area of 36.1 square miles (93 km2), all land.

Oatka Creek, a tributary of the Genesee River, flows northward through the town.

16.7% of all households were made up of individuals, and 5.0% had someone living alone who was 65 years of age or older.