Aristotle Socrates Onassis was a Greek and Argentine business magnate. He amassed the world's largest privately-owned shipping fleet and was one of the world's richest and most famous men. He was married to Athina Mary Livanos, had a long-standing affair with opera singer Maria Callas, and was married to American former First Lady Jacqueline Kennedy.

A business magnate, also known as an industrialist or tycoon, is a person who has achieved immense wealth through the creation or ownership of multiple lines of enterprise. The term characteristically refers to a powerful entrepreneur and investor who controls, through personal enterprise ownership or a dominant shareholding position, a firm or industry whose goods or services are widely consumed. Such individuals have been known by different terms throughout history, such as robber barons, captains of industry, moguls, oligarchs, plutocrats, or tai-pans.