G retel Packer is an Australian billionaire heiress, investor, and philanthropist. She is the daughter of the late, legendary media tycoon Kerry Packer, and the granddaughter of Sir Frank Packer, who founded the family's media empire. For decades, the Packer family was the most powerful and influential dynasty in Australian media, with vast holdings in television (the Nine Network) and magazines.

Upon her father's death, Gretel and her younger brother, James, inherited the family's multi-billion dollar empire. While her brother took the lead in running the family's businesses, particularly in building the Crown Resorts casino empire, a later restructuring of the family's assets left Gretel with a massive and independent fortune, primarily in cash and a stake in Crown. She has since focused on her own investments and has become a major and highly respected philanthropist and patron of the arts in Australia, serving on the boards of numerous cultural institutions, including the Sydney Theatre Company.