Little Lake Butte des Morts is a lake in the US state of Wisconsin, eight miles north of Lake Butte Des Morts. It is part of the Fox–Wisconsin Waterway and receives its inflow from a short segment of the Fox River which drains from the north end of Lake Winnebago around Doty Island. The north end of Little Lake Butte des Morts becomes the section of the Fox River running to Green Bay. The lake is part of the Butte des Morts region in Winnebago County, Wisconsin.