Flossmoor (/ˈflɒsmɔːr/) is a village in Cook County, Illinois, United States. The population was 9,704 at the 2020 census. Flossmoor is approximately 24 miles (39 km) south of the Chicago Loop. It is closely tied to neighboring Homewood, sharing a high school and park district.

Although Flossmoor's founding and settlement can be traced to the 19th century, the city was first recognized as an affluent community in the 1920s when it became known as a cultural and recreational mecca of elite country clubs and stately golf courses.

The 1920 PGA Championship and the Western Open golf tournaments of 1906 and 1912 were held in town. Flossmoor was incorporated as a village in 1924. In the years since, Flossmoor has gained recognition from area real estate and tourist concerns as the "status" suburb of south/southwest suburban Chicago. By the 1970s, Flossmoor had transitioned from a white Protestant community to the home of many Jewish Americans and Italian Americans. As of the 2010s, Flossmoor's population is predominantly African American.

According to the 2021 census gazetteer files, Flossmoor has a total area of 3.66 square miles (9.48 km²), all land. Flossmoor has a station on the Metra Electric Main Line, which provides access to the Chicago Loop and the University of Chicago.

As of the 2020 census, Flossmoor had a population of 9,704, with 3,527 households and 2,499 families residing in the village.

The population density was 2,650.64 inhabitants per square mile (1,023.42/km²). There were 3,702 housing units at an average density of 1,011.20 per square mile (390.43/km²). Of the 3,702 housing units, 4.7% were vacant. The homeowner vacancy rate was 2.4% and the rental vacancy rate was 7.9%.

The median age was 45.0 years. 21.9% of residents were under the age of 18 and 20.9% were 65 years of age or older. For every 100 females, there were 88.6 males, and for every 100 females age 18 and over, there were 83.7 males age 18 and over.

100.0% of residents lived in urban areas, while 0.0% lived in rural areas.