Wyoming County is a county in the U.S. state of New York in the state's western area. As of the 2020 census, the population was 40,531. The county seat is Warsaw. The name is modified from a Lenape (Delaware) Native American word meaning "broad bottom lands". Wyoming County was formed from Genesee County in 1841. Wyoming County is one of New York's mostly agricultural counties. With an estimated 47,500 dairy cows in the county, there are more cattle in Wyoming County than people. The county is part of the Finger Lakes region of the state.

Warsaw is a village and the county seat of Wyoming County, New York, United States. It lies inside the Town of Warsaw. The village of Warsaw is near the center of the town in a valley. The population was 3,473 at the 2010 census. A branch of Genesee Community College is in Warsaw.