Athina Mary "Tina" Niarchos (em grego: Αθηνά (Τίνα) Λιβανού nascida Livanos previamente Spencer-Churchill Londres, 19 de Março de 1929 – Paris, 10 de Outubro de 1974) era a filha mais nova do magnata grego Stavros G.dbc:British_expatriates_in_the_United_States.dbr:John_Spencer-Churchill,_11th_Duke_of_Marlborough.dbr:Tina_Onassis_Niarchos_PersonFunction_1.Livanos era filho e neto de marinheiros, e um dos três mais poderosos armadores gregos da época, quando a fortuna na Grécia retornou aos seus portos e estaleiros. She was best known as the first wife of Aristotle Onassis, but she later married her older sister Eugenia's widower, Stavros Niarchos. Athina Mary "Tina" Onassis Niarchos (née Livanos Greek: Αθηνά (Τίνα) Λιβανού, pronounced 19 March 1929 – 10 October 1974) was an English-born Greek socialite and shipping heiress, the second daughter of the Greek shipping magnate Stavros Livanos and Arietta Zafiraki.
Contrajo matrimonio en tres ocasiones: su primer matrimonio fue con Onassis, el segundo con el duque inglés, quien estaba emparentado con figuras importantes de su país, como Winston Churchill o Diana de Gales, y el tercero y último con el empresario Stavros Niarchos, viudo de su hermana Eugenia.
Niarchos’ answer to Onassis’ wedding was unexpected and added a new dimension to the hatred between the two men: A year later he married the equally sought-after, but less beautiful, Eugenia Livanos-Tina’s older sister. The marriage also marked the beginning of an epic rivalry between the two wealthiest and most prominent Greeks of the time, Onassis and Niarchos. Késbb Christina elvetette a pert, és Niarchos visszaadta Christinának felesége összes pénzét, valamint ékszereit, mveit és egyéb személyes tárgyait. It was the social event of the year for the rich and famous. Lánya, Christina Onassis beperelte Stavros Niarchost, az anyja özvegyét, anyja becsült 250 millió dolláros (1974 dolláros) vagyonáért, amely szerint a házasságot meg kell semmisíteni. The lavish wedding took place in New York in 1946, with shipowner Andreas Embirikos as best man. Tina Livanos was married off to Onassis at age 17