As A Surname
- Aristotle Onassis (1906–1975), a Greek shipping magnate
- Alexander Onassis (1948–1973), son of Aristotle Onassis
- Christina Onassis (1950–1988), a Greek shipping magnate and daughter of Aristotle Onassis
- Athina Onassis Roussel (1985–), daughter of Christina Onassis
- Erick Onassis (1968–), an American rapper also known as Erick Sermon
- Jacqueline Kennedy Onassis (1929–1994), the wife of U.S. President John F. Kennedy (later the wife of Aristotle)
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