Joseph Theodore Leslie "Squizzy" Taylor (29 June 1888 – 27 October 1927) was an Australian gangster from Melbourne.
He appeared repeatedly and sometimes prominently in Melbourne news media because of suspicions, formal accusations, and some convictions related to a 1919 violent gang war, to his absconding from bail and hiding from the police in 1921–22, and to his involvement in a robbery where a bank manager was murdered in 1923.
Taylor enjoyed a fearsome reputation in 1920s Melbourne.
A "spiv", described as the Australian equivalent of the 'American bootleggers', his crimes ranged from pickpocketing, assault and shopbreaking to armed robbery and murder.
He also derived income from sly-grog selling, two-up schools, illegal bookmaking, extortion, prostitution and, in his later years, is believed by some to have moved into cocaine dealing.His life and times came back into public attention, with the television series on the Nine television network in Australia, Underbelly: Squizzy, which is loosely based biographic account of Taylor's life.