is a city in Green Lake County, Wisconsin, United States. The population was 1,100 at the 2000 census. The city is located on the north side of Big Green Lake. The city of Green Lake is the county seat for the county of Green Lake. The Town of Green Lake is located on the south side of Big Green Lake, opposite the city.
Green Lake is located at (43.842675, -88.957813). It is near the towns of Princeton and Ripon, and is approximately 30 minutes west of Fond du Lac.
According to the United States Census Bureau, the city has a total area of 1.6 square miles (4.2 km²), of which, 1.4 square miles (3.6 km²) of it is land and 0.2 square miles (0.6 km²) of it (14.20%) is water. Green Lake is the second deepest inland lake in Wisconsin (Wazee Lake) , measuring 237 feet deep at its greatest depth, but is the deepest natural inland lake in the state of Wisconsin.