Goose Lake is a large alkaline lake in the Goose Lake Valley on the Oregon–California border in the United States. Like many other lakes in the Great Basin, it is a pluvial lake that formed from precipitation and melting glaciers during the Pleistocene epoch. The north portion of the lake is in Lake County, Oregon, and the south portion is in Modoc County, California. The mountains at the north end of the lake are part of the Fremont National Forest, and the south end of the lake is adjacent to Modoc National Forest lands.