Athina Onassis is a Greek-French heiress with an estimated net worth of $1 billion. She is Aristotle Onassis' only surviving heiress. Aristotle Onassis was a shipping magnate from Greece who had a daughter named Cristina, the mother of Athina Onassis. Cristina Onassis inherited 55% of her father's fortune.

Athina Onassis was born on January 28, 1985 in Neuilly-sur-Seine, France. In addition to being a member of the renowned Onassis family, she is a competitive show jumper. A popular equestrian athlete, she is also known as the owner of AD Sport Horses. Since 2005, she has been married to Álvaro Affonso de Miranda Neto.

The remaining 45% of Aristotle Onassis' wealth, minus the $26 left to his widow, was given to the Alexander S. Onassis Public Benefit Foundation, which was established in honor of the former's late son.