Hemlock Lake is one of the minor Finger Lakes. It is mostly located in Livingston County, New York, south of Rochester, with a portion overlapping into Ontario County. Hemlock is a translation of the Seneca name for the lake, O-neh-da Te-car-ne-o-di.

The Finger Lakes are a group of eleven long, narrow, roughly north–south lakes located directly south of Lake Ontario in an area called the Finger Lakes region in New York, in the United States. This region straddles the northern and transitional edge of the Northern Allegheny Plateau, known as the Finger Lakes Uplands and Gorges ecoregion, and the Ontario Lowlands ecoregion of the Great Lakes Lowlands.