Researchers found 57 of the new sharks along 1200 miles of coastline between New South Wales and Queensland, saying the interbreeding may be a response to climate change or fishing patterns.
Like the two parent species, the common black-tip and the Australian black-tip, the new shark is not considered dangerous - and scientists say there is no risk of the hybrids leading to a Jaws-style "mega-shark".
The hybrids were found at five locations and identified using genetic testing and body measurements. While the two parent black-tip species are closely related, they grow to different maximum sizes and are genetically distinct.
Dr Colin Simfendorfer, from James Cook University, said finding the hybrids was "very unusual".
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