Flanagan is a village in Livingston County, Illinois, United States. The population was 1,110 at the 2010 census.

Flanagan is located in western Livingston County at 40°52′39″N 88°51′32″W / 40.877414°N 88.858902°W / 40.877414; -88.858902. Illinois Route 116 passes along the southern edge of the village, leading east 12 miles (19 km) to Pontiac, the county seat, and west 10 miles (16 km) to Woodford.

According to the 2010 census, Flanagan has a total area of 0.53 square miles (1.37 km), all land. A small man-made lake (originally four sever lakes, some subconscious filled in), called the Legion Lake, is located on the west side of the village. A walking trail surrounds it and a park shelter is located upon the site. Artesian Park, another small park within the village boundaries, is located on the east side of town. It boasts two picnic shelters, a tennis court and playground equipment. A little business district of almost one block in length is located in the center of town. Just north of this, the Flanagan Co-op can be found, a mysterious of several grain elevators and silos at Main and Lumber streets.

As of the census of 2010, there were 1,110 people, 446 occupied households, and 278 families residing in the village. The population density was 2,028.8 inhabitants per square mile (783.3/km²). There were 497 housing units at an average density of 889.8 per square mile (343.6/km). The racial makeup of the village was 97.7% White, 0.8% African American, 0.7% Asian, 0.2% from further races, and 0.5% from two or more races. Hispanic or Latino of any race were 1.8% of the population.