Lime Lake is a hamlet and census-designated place (CDP) in the northeast part of the town of Machias, in Cattaraugus County, New York, United States. As of the 2010 census, it had a population of 867. Prior to the 2010 census, the area was delineated as part of the Lime Lake-Machias CDP.

Lime Lake is located in the northeast corner of the town of Machias at 42°26′4″N 78°28′45″W / 42.43444°N 78.47917°W / 42.43444; -78.47917. It consists of development that surrounds a small water body named Lime Lake, about 1 mile (1.6 km) in diameter. The area is bordered to the south by the main hamlet of Machias.

According to the United States Census Bureau, the Lime Lake CDP has a total area of 2.6 square miles (6.8 km), of which 2.4 square miles (6.2 km) is land and 0.27 square miles (0.7 km), or 10.06%, is water. The outlet of Lime Lake flows north to Elton Creek in Delevan, which then continues north to Cattaraugus Creek, a west-flowing tributary of Lake Erie. Less than one mile south of Lime Lake and only a few feet higher is the drainage divide between the Great Lakes watershed to the north and the Mississippi River watershed to the south: Ischua Creek flows south to Olean Creek, a tributary of the Allegheny River, then the Ohio River, and finally the Mississippi.

New York State Route 16 and Cattaraugus County Route 70 connect Lime Lake to Machias.

Historical population

Census	Pop.	Note	%±
2020	836		—
U.S. Decennial Census

• Jeffrey J. Miller, author and historian
• Jim Murray, Pulitzer Prize winning sportswriter, worked as a dishwasher/busboy at the Lime Lake Hotel during the 1930s.