Big Oaks National Wildlife Refuge

 nature conservation park / area, wildlife management area, closed / former military

 Upload a photo

Big Oaks National Wildlife Refuge is a 50,000-acre (202 km2) wildlife refuge operated by the United States Fish and Wildlife Service in southeast Indiana, United States near Madison, Indiana. The refuge is the largest of Indiana's three National Wildlife Refuges (Muscatatuck National Wildlife Refuge near Seymour and Patoka River National Wildlife Refuge and Management Area near Oakland City), and is located in parts of Ripley, Jefferson, and Jennings counties.

The refuge was formed in 2000 after a 1989 order to gradually close the Jefferson Proving Ground, a World War II era munitions testing facility, which was completed by 1995. The refuge is located north of the historic firing line and surrounds a 1,000-acre (4 km2) parcel operated by the Indiana Air National Guard. A zone used for firing tests remains off limit to the public due to the prohibitive cost of cleanup.