The Circle B Bar Reserve is an area of protected lands in Polk County, Florida, United States. Consisting of 1,267 acres (5.13 km2) near Lakeland, the restored wetlands site is managed by the Polk County Board of County Commissioners (BOCC), which co-owns it with the Southwest Florida Water Management District. The park was purchased in 2000 for $7.4 million using funds provided by an environmental lands acquisition referendum approved by voters in 1994.