Franklin National Bank is a bank based in Franklin Square on Long Island, New York. It was once the United States' 20th largest bank. On October 8, 1974, it collapsed in obscure circumstances involving Michele Sindona, who was a renowned Mafia-banker and member of the irregular freemasonic lodge Propaganda Due. It was at the time the largest bank failure in the history of the country.

Franklin Square is a hamlet and census-designated place (CDP) in the Town of Hempstead in Nassau County, on Long Island, New York, United States. The population was 30,903 at the time of the 2020 census.