Lackawanna is a city in Erie County, New York, United States, just south of the city of Buffalo in western New York State. The population was 19,949 at the 2020 census. It is one of the fastest-growing cities in New York, growing in population by 10% from 2010 to 2020. It is part of the Buffalo-Niagara Falls metropolitan area. The city of Lackawanna is in the western part of Erie County.

Erie County is a county along the shore of Lake Erie in western New York State. As of the 2020 census, the population was 954,236. The county seat is Buffalo, which makes up about 28% of the county's population. Both the county and Lake Erie were named for the regional Iroquoian language-speaking Erie tribe of Native Americans, who lived in the area before 1654. They were later pushed out by the more powerful Iroquoian nations tribes. The county is part of the Western New York region of the state.