Onassis may refer to:
People with the name
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)
Other uses Onassis glasses, a style of oversized sunglasses popularized by Jacqueline Onassis