Dona Bertarelli (born Donata Guichard Bertarelli) is a Swiss billionaire heiress, philanthropist, investor, and acclaimed sportswoman. Her immense fortune stems from her inheritance of the pioneering biotechnology company Serono SA, founded by her family in 1906. She is the sister of fellow billionaire Ernesto Bertarelli.

Born in Rome, Italy, in 1968, her upbringing was defined by the family's deep connection to science and competitive sports. She holds a B.Sc. degree from Boston University. Dona became active in the family business, Serono, in 1992 as an Executive Director of Public and Professional Affairs, where she led early philanthropic and educational programs, particularly those focused on reproductive health and infertility.

Dona Bertarelli's career is defined by her strategic commitment to philanthropy and her record-breaking achievements in sailing. She co-founded the Bertarelli Foundation in 1999, focusing on science, education, and economic research. Her immense wealth was secured in 2007 when Serono was sold to Merck KGaA for a massive financial return.

Post-exit, Dona leveraged her fortune for global social impact and personal passion. She is a world-renowned sailing champion, co-founding the Sails of Change (formerly Spindrift racing) professional sailing team in 2011. She became the first helmswoman to win the Bol d'Or Mirabaud race and became the fastest woman to sail around the world (in 2015, during an attempt for the Jules Verne Trophy). She is a major ocean conservationist, founding the Pew Bertarelli Ocean Legacy, which has worked to establish the first generation of marine protected areas globally.

Dona Bertarelli is a major global philanthropist, focusing intensely on ocean conservation and scientific research. Her structural social impact is her work in creating Marine Protected Areas (MPAs) globally (over 16 million square kilometers conserved) and funding research into rare cancers (Bertarelli Rare Cancers Fund) and neuroscience.

Her role as a Special Adviser for the Blue Economy for the United Nations Conference on Trade and Development (UNCTAD) and a founder of the Womanity Foundation cements her legacy as a powerful figure in global sustainability and gender equality.