D ona Bertarelli is a Swiss billionaire businesswoman, philanthropist, and sportswoman. She is the sister of Ernesto Bertarelli, and together they inherited the Swiss pharmaceutical company Serono after the death of their father. Serono was a leader in biotechnology, particularly in treatments for female infertility. Dona served as an executive director at the company.

In 2007, the Bertarelli family sold Serono to the German drugmaker Merck KGaA for over $13 billion, a deal that massively increased the family's already substantial wealth. Since the sale, Dona has focused on managing her portion of the family's fortune through her own investment vehicles, with a particular focus on luxury hospitality. She is also a passionate and accomplished competitive sailor, holding the record for the fastest woman to sail around the world. She is a dedicated philanthropist, with a strong focus on ocean conservation through her Bertarelli Foundation.