Joseph Filkowski was a Polish-American gangster active in Cleveland, Ohio. A longtime figure in Cleveland's underworld, Joseph Filkowski led the Polish bootlegging gang, the Flats Mob. He was responsible for a rash of bank robberies and jewelry heists in Cleveland and New York City between 1930 and 1932; he was also associated with numerous prominent criminal figures in the Midwest, such as Joseph Stazek and Morris Cohen.