Le Roy, or more commonly LeRoy, is a town in Genesee County, New York, United States. The population was 7,641 at the time of the 2010 census. The town is named after one of the original land owners, Herman Le Roy. The town lies on the southwestern edge of Monroe County. Within the town is a village of Le Roy. The Jell-O gelatin dessert was invented and first manufactured in Le Roy.

Genesee County is a county in the U.S. state of New York. As of the 2020 census, the population was 58,388. Its county seat is Batavia. Its name is from Seneca word Gen-nis'-hee-yo, meaning "the Beautiful Valley". The county was created in 1802 and organized in 1803. The county is part of the Finger Lakes region of the state.