Lake Galena is a reservoir in Jo Daviess County, Illinois, located near Galena.
The lake formed following the damming of Smallpox Creek in 1974. Smallpox Creek is one of many tributaries of the Mississippi River.
Lake Galena receives its water from a watershed about in size and is located at an elevation of about . It encompasses an area of and with of shoreline. It is located within a private development of Galena known as the Galena Territory.
The lake is mostly used for recreational purposes including boating and fishing. The lake is managed by a non-profit corporation, The Galena Territory Association, who manages a marina located on the east end of the lake. The eighth hole on the Eagle Ridge Resort & Spa's North golf course crosses a small inlet of the lake.