Pierre Omidyar was born on June 21, 1967, in Paris, France, to Iranian settlers, Elahé Mir-Djalali Omidyar, and her husband, Cyrus Omidyar. His parents moved to Paris to attend school in their teens. Due to his father's job, the family moved around several times. When Pierre was six, the family moved from France to Maryland, the United States. He later moved to Hawaii, where he completed the eighth and ninth grade.
His mother is a renowned linguistics scholar, and his father was employed at Johns Hopkins University as a surgeon, and now practices in Aliso Viejo, California. Omidyar had become a naturalized American citizen. His parents got divorced, so he lived with his mother and spent weekends with his father.