Onassis may refer to:

• 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 (born 1985), daughter of Christina Onassis
• Erick Onasis (born 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 Onassis)

• Onassis glasses, a style of oversized sunglasses popularized by Jacqueline Onassis

This disambiguation page lists articles associated with the title Onassis.
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