Kate Leigh was an Australian criminal and a prominent figure in the Sydney underworld during the early 20th century. Born in 1881, she became known for her involvement in illegal activities, particularly in the areas of prostitution and bootlegging. Leigh operated a successful brothel and was known for her fierce personality and business acumen. Leigh was also associated with various criminal gangs and was often in conflict with rival figures, including Tilly Devine, another notorious criminal. Her life of crime and her influence in the Sydney underworld made her a significant figure in Australian history, particularly in the context of organized crime during that era.