"This is an exciting time for Libby to join us as we strengthen our focus on merchants and consumers," said PayPal Asia Pacific senior vice president and general manager Rohan Mahadevan.
"Alongside her deep knowledge of technological and digital disruptions, her stakeholder management skills and ability to build strong leadership teams will be valuable as she leads the highly engaged local team to drive the continued profitable growth of our Australia business.
"She will play a critical role in identifying new opportunities and further entrenching PayPal as the leading mobile and online payment service in Australia."
In addition to her responsibilities for the Australian business, she will serve as an executive committee member of the PayPal APAC leadership team.
Roy is a graduate of Curtin University of Technology, and also holds an MBA from the University of New South Wales.
Her predecessor, Jeff Clementz, is returning to the US to take up a new role as vice president for compliance operational excellence in global operations.