List of American heiresses

This is an incomplete list of some American socialites, wealthy or famous, who married into the European nobility, peerage and royalty :

Frances Work, great-grandmother of Diana, Princess of Wales

Consuelo Vanderbilt, member of Vanderbilt family and duchesses of Marlborough

• Elizabeth de Talleyrand-Périgord, Duchess de Dino (née Elizabeth Beers-Curtis) in 1867
• Elizabeth Brancaccio, Princess Brancaccio, Princess di Triggiano ans Duchess di Lustra (née Elizabeth Hickson Field) on 3 March 1870
• Countess Miklós Ferenc Esterházy, Baroness zu Galántha (née Sarah "Sally" Virginia Carroll) on 6 June 1870
• Jeanie Musgrave, Lady Musgrave (née Jeanie Lucinda Field) on 20 June 1870
• Hon. Mrs Francis Richard Plunkett, Lady Plunkett (née May Tevis Morgan) on 22 August 1870
• Princess Alexander zu Lynar, Princess zu Lynar (née May Amelia Parsons) on 16 May 1871
• Countess Johannes von Francken-Sierstorpff (née May Knowlton) in 1873
• Lady Randolph Spencer-Churchill (née Jeanette "Jennie" Jerome) on 15 April 1874
• Eliza Graham, Lady Graham of Esk (née Eliza Jane Burns) on 1 August 1874
• Elizabeth de Choiseul-Praslin, Duchess de Praslin (née Elizabeth Forbes) on 17 December 1874
• Alice Chapelle de Jumilhac, Duchess de Richelieu on 27 February 1875, then Princess of Monaco on 30 October 1889 (née Alice Heine)
• Jane Molesworth, Lady Molesworth (née Jane Graham Frost) on 3 June 1875
• Margaret de Stuers, Dame de Stuers in 1875, then Countess Eliot Zborowski, Countess de Montsaulvain in 1880 (née Margaret Laura Astor Carey)
• Consuelo Montagu, Duchess of Manchester (née Maria Consuelo Iznaga-Clement) on 22 May 1876
• Elizabeth Harcourt, Lady Harcourt (née Elizabeth Cabot Motley, previously Ives) on 2 December 1876
• Minnie Paget, Lady Paget (née Mary "Minnie" Fiske Stevens) on 27 July 1878
• Edith Playfair, Baroness Playfair (née Edith Russell) on 3 October 1878
• Countess László Zichy de Zich et Vásonykeő (née Mary Knapp) on 21 May 1879
• Catherine Norton, Baroness Grantley of Markenfield (née Catherine Buckner McVickar, previously Norton) on 5 November 1879
• Minna Paget, Marchioness of Anglesey (née Mary "Minna" Livingston King, previously Wodehouse) on 26 June 1880
• Frances Roche, Baroness Fermoy (née Frances Ellen Work) on 22 September 1880
• Flora Fermor-Hesketh, Lady Hesketh (née Florence "Flora" Emily Sharon) on 22 December 1880
• Natica Lister-Kaye, Lady Lister-Kaye (née Maria Natividad "Natica" Iznaga-Clement) on 5 December 1881
• Baroness Edmund Wucherer von Huldenfeld (née Margaret Plater Price) on 20 July 1882
• Baroness Gábor Bornemisza de Kászon et Impérfalva (née Mathilde Louise Price) on 16 May 1883
• Hon. Mrs Hugh Oliver Northcote (née Edith Livingston Fish) on 6 June 1883
• Anita Wolseley, Lady Wolseley (née Anita Theresa Murphy) on 17 July 1883
• Princess Charles Poniatowski (née Maud Staples Ely Goddard) on 4 April 1884
• Hon. Mrs William Frederick Cuthbert Venables-Vernon (née Louisa Frost) on 17 April 1884
• Leonie Leslie, Lady Leslie (née Leonie Blanche Jerome) on 2 October 1884
• Evelyn Colonna, Princess di Stigliano (née Evelyn Julia Bryant Mackay) on 11 February 1885
• Josephine Ruspoli, Princess di Poggio Suasa (née Josephine Mary Beers-Curtis) on 18 June 1885
• Daisy Balluet d'Estournelles de Constant, Baroness de Constant de Rebecque (née Daisy Sedgwick Berend) on 25 June 1885
• Frances Venables-Vernon, Baroness Vernon (née Frances Margaret Lawrance) on 14 July 1885
• Countess Frederik Christopher Otto Raben-Levetzau (née Lillie Suzanne "Nina" Moulton) on 8 April 1886
• Aimee Clarke, Lady Clarke of Rupertswood on 22 December 1886, then Aimee Grey-Egerton, Lady Grey-Egerton (née Aimee May Cumming) on 26 April 1910
• Adèle de Talleyrand-Périgord, Duchess de Dino (née Adele Livingston Sampson, previously Stevens) on 25 January 1887
• Ellen Butler, Marchioness of Ormonde (née Ellen Sprague Stager) on 8 March 1887
• Princess Louis de Scey-Montbéliard on 27 July 1887, then Princess Edmond de Polignac on 15 December 1893 (née Winnaretta Eugenie Singer)
• Marchioness Paolo d'Adda Salvaterra on 22 February 1888, then Countess Horace de Choiseul-Praslin on 25 May 1906 (née Mary Hooper)
• Isabelle Decazes, Duchess Decazes and Duchess af Glücksbierg (née Isabelle Blanche Singer) on 28 April 1888
• Louisa Walpole, Countess of Orford (née Louisa Melissa Corbin) on 17 May 1888
• Lilian Spencer-Churchill, Duchess of Marlborough (née Jane Lilian Warren Price, previously Hammersley) on 29 June 1888
• Florence Beccadelli di Bologna, Princess di Camporeale and Duchess di Adragna (née Florence Ethel Binney, previously Kingsland) on 6 September 1888
• Belle Herbert, Lady Herbert (née Leila Belle Wilson) on 27 November 1888
• Mary de Ágreda, Countess de Casa de Ágreda (née Mary Louise Lafarge) on 11 February 1889
• Elizabeth Smith-Barry, Baroness Barrymore (née Elizabeth Wadsworth, previously Post) on 28 February 1889
• Jennie Naylor-Leyland, Lady Naylor-Leyland (née Jeanie "Jennie" Willson Chamberlain) on 5 September 1889
• Princess Franz von Hatzfeld-Wildenburg, Princess von Hatzfeld (née Clara Huntingdon) on 28 October 1889
• Baroness Hugh Colin Gustav George Halkett (née Sarah Olivia Phelps Stokes) on 11 February 1890
• Countess Maximilian zu Pappenheim (née Mary Wistar Wheeler) on 30 April 1890
• Hon. Mrs Amyas Stafford Northcote (née Helen May Dudley) on 14 May 1890
• Clara de Riquet, Princess de Caraman-Chimay (née Clara Ward) on 19 May 1890
• Countess Charles de Galliffet (née Frances Stevens) on 15 November 1890
• Frances Leigh, Baroness Leigh (née Frances Helene Forbes Beckwith) on 29 November 1890
• Princess Friedrich Wilhelm von Ardeck, Princess von Ardeck (née Anne Hollingsworth Price) on 17 December 1890
• Marcelite Le Tonnelier, Marchioness de Breteuil (née Marcelitta "Marcelite" Thorn Garner) on 3 March 1891
• Claire de Marmier-Choiseul, Duchess de Choiseul (née Claire Coudert) on 13 March 1891
• Countess Reinhold Abraham Lewenhaupt (née Ellen Bayard) on 2 April 1891
• Florence Gordon-Cumming, Lady Gordon-Cumming (née Florence Josephine Garner) on 10 June 1891
• Countess Ferdinand Blücher von Wahlstatt (née Alma Loeb) on 19 July 1891
• Countess Miecislaw Orlowski (née Mabel Ledyard Stevens) on 17 December 1891
• Mattie-Elizabeth de La Rochefoucauld, Duchess de La Rochefoucauld (née Mattie Elizabeth Mitchell) on 11 February 1892
• Mary Grey-Egerton, Lady Grey-Egerton (née Mary Carolyn Campbell Cuyler) on 4 January 1893
• Cornelia Craven, Countess of Craven (née Cornelia Martin) on 18 April 1893
• Florence Hamilton-Temple-Blackwood, Marchioness of Dufferin and Ava on 16 October 1893, then Florence Curzon, Countess Howe on 11 December 1919 (née Florence Davis)
• Adele Capell, Countess of Essex (née Adele Grant) on 14 December 1893
• Virginia Coventry, Viscountess Deerhurst (née Virginia Lea Daniel) on 10 March 1894
• Countess Henri de Frankenstein (née Anne Seabury Brewster) on 28 March 1894
• Elizabeth Poniatowski, Princess Poniatowski and Princess di Monte Rotondo (née Elizabeth Sperry) on 6 October 1894
• Princess Sergei Belosselsky-Belozersky (née Susan Tucker Whittier) on 7 October 1894
• Lady Francis Pelham-Clinton-Hope (née Mary Augusta "May" Yohé) on 27 November 1894
• Countess Boni de Castellane on 4 March 1895, then Duchess de Sagan on 7 July 1908 (née Anna Gould)
• Maud Cunard, Lady Cunard (née Maud Alice Burke) on 18 April 1895
• Mary Curzon, Marchioness Curzon of Kedleston, Vicereine of India (née Mary Victoria Leiter) on 22 April 1895
• Jane Bourbon del Monte, Princess di San Faustino (née Jane Allen Campbell) on 7 June 1895
• Princess Karl zu Isenburg und Büdingen (née Bertha Lewis) on 24 August 1895
• Baroness Carl August von Gersdorff (née Helen Suzette Crowninshield) on 18 September 1895
• Consuelo Spencer-Churchill, Duchess of Marlborough (née Consuelo Vanderbilt) on 6 November 1895
• Pauline Paget, Baroness Queenborough (née Pauline Payne Whitney) on 25 July 1895
• Margaret Pineton de Chambrun, Marchioness de Chambrun (née Margaret Rives Nichols) on 12 December 1895
• Countess Béla Maria Rudolf Zichy de Zich et Vásonykeő (née Mabel Elizabeth Wright, previously Iznaga-Clement) on 26 December 1895
• Mary-Gwendoline des Monstiers-Mérinville, Marchioness des Monstiers-Mérinville (née Mary Gwendoline Caldwell) on 19 October 1896
• Marguerite Wallop, Countess of Portsmouth (née Marguerite Morehead Walker) on April 1897
• Countess Manfred von Matuschka in 1897, then Princess della Torre e Tasso and Duchess di Castel Duino in 1932 (née Helena "Ella" Holbrook Walker)
• Countess Leon Albin Gebhard Moltke-Hvitfeldt (née Edith Marion Garner) on 8 March 1898
• Princess Nikolaï Engalitcheff (née Evelyn Pardridge, previously Clayton) on 11 October 1898
• Hon. Mrs Rowland Charles Frederick Leigh (née Mabel Gordon) on 31 October 1898
• Cora Byng, Countess of Strafford (née Cora ???, previously Colgate) on 6 December 1898
• Princess Franz von Auersperg (née Florence Ellsworth Hazard) on 14 June 1899
• Mary Harcourt, Viscountess Harcourt (née Mary Ethel Burns) on 1 July 1899
• Anita Lante Montefeltro della Rovere, Princess and Duchess Lante Montefeltro della Rovere, Duchess di Bomarzo (née Anita Russell Allen) on 11 September 1899
• Princess Mikhail Cantacuzène, Countess Spiransky (née Julia Dent Grant) on 24 September 1899
• Princess Ludovico Lante Montefeltro della Rovere (née Susanna Tilghman) on 10 January 1900
• Hon. Mrs Charles John Coventry (née Lily Whitehouse) on 16 January 1900
• Baroness Henri Hottinguer (née Marian Hall Munroe) on 23 January 1900
• Hon. Mrs Hubert George Beaumont (née Elisa Mercedes Grace) on 26 May 1900
• Grace Wynn, Baroness Newborough (née Grace Bruce Carr) on 7 November 1900
• Helena Montagu, Duchess of Manchester (née Helena Zimmerman) on 14 November 1900
• Countess Aldebert de Chambrun (née Clara Eleanor Longworth) on 19 February 1901
• Princess Enrico Ruspoli (née Eugenia "Jenny" Enfield Berry, previously Bruton) on 2 March 1901
• Ethel Beatty, Countess Beatty (née Ethel Field, previously Tree) on 22 May 1901
• Maria Rospigliosi, Princess Rospigliosi, Princess di Castiglione and Duchess di Zagarolo (née Mary "Maria" Jennings Reid) on 26 August 1901
• Helen de Talleyrand-Périgord, Duchess de Valençay (née Helen Stuyvesant Morton) on 5 October 1901
• Elena Hely-Hutchinson, Countess of Donoughmore (née Elena Maria Grace) on 21 December 1901
• Maude Baring, Baroness Revelstoke (Maude Louise Lorillard, previously Tailer) on 8 November 1902
• Ellen de Boyer de Fonscolombe, Baroness de Meyronnet-Saint-Marc (née Ellen Nixon Waln) on 28 March 1903
• Alice Seymour, Countess of Yarmouth (née Alice Cornelia Thaw) on 27 April 1903
• Princess Giambattista Pio Sigismondo Rospigliosi (née Ethel Julia Bronson) on 16 May 1903
• Princess Eugene Lazarovich-Hrebelianovich (née Eleanor "Nellie" Hulda Calhoun) on 11 June 1903
• Mary Innes-Ker, Duchess of Roxburghe (née Mary Goelet) on 10 November 1903
• Constance de Lubersac, Marchioness de Lubersac (née Constance Livermore) on 26 January 1904
• Countess Louis de Gontaut-Biron (née Martha "Marthe" Leishman) on 27 June 1904
• Baroness Reinhart Bachofen von Echt (née Alice Pfizer) on 5 September 1904
• Countess Botho zu Eulenburg on 22 September 1904, then Countess Hans Nikolaus Finck von Finckenstein on 28 June 1922 (née Nelly Lyttle)
• Countess René du Temple de Rougemont (née Edith Devereux Clapp) on 6 December 1904
• Marchioness Giuseppe Lanza di Ajeta (née Martina Potter Jones) on 8 December 1904
• Mevrouw Reneke de Marees van Swinderen (née Elizabeth Lindsay Glover) on 21 December 1904
• Daisy Howard, Countess of Suffolk (née Margaret "Daisy" Hyde Leiter) on 26 December 1904
• Baroness Sergei Koreff (née Alletta Van Reypen) on 6 June 1905
• Béatrice de Galard de Brassac de Béarn, Princess de Chalais (née Beatrice Winans) on 24 June 1905
• Hon. Mrs Frederick Edward Guest (née Amy Phipps) on 28 June 1905
• Alberta Montagu, Countess of Sandwich (née Alberta Sturges) on 25 July 1905
• Florence ???, Duchess di San Martino (née Florence Croker) on 19 August 1905
• Eloise Heathcote-Drummond-Willoughby, Countess of Ancaster (née Eloise Lawrence Breese) on 6 December 1905
• Frances Baring, Baroness Ashburton (née Frances Donnelly) on 19 February 1906
• Nancy Astor, Viscountess Astor (née Nancy Witcher Langhorne, previously Shaw) on 3 May 1906
• Hon. Mrs Lionel John Olive Lambart (née Adelaide Douglas Randolph) on 8 May 1906
• Princess François-Robert de Broglie (née Estella Dolores Alexander) on 14 August 1906
• Madeleine d'Andigné, Marchioness d'Andigné (née Madeleine Ives Goddard) on 29 December 1906
• Mary Elsie Torlonia, Princess di Civitella-Cesi (née Mary Elsie Moore) on 15 August 1907
• Lady Alastair Robert Innes-Ker (née Anne Breese) on 10 October 1907
• Hon. Mrs Henry Thomas Coventry (née Edith Kip, previously McCreery) on 3 December 1907
• Countess László Széchenyi de Sárvár-Felsővidék (née Gladys Moore Vanderbilt) on 27 January 1908
• Théodora d'Albert de Luynes, Duchess de Chaulnes (née Theodora Shonts) on 15 February 1908
• Beatrice Forbes, Countess of Granard (née Beatrice Mills) on 14 January 1909
• Countess Hermann von Seherr-Thoss (née Muriel White) on 28 April 1909
• Countess Ferdinand Johannes Hieronymus von Colloredo-Mannsfeld (née Eleonore Iselin) on 10 May 1909
• Princess Giovanni del Drago, Marchioness di Riofreddo (née Josephine Kleiner, previously Schmid) on 22 May 1909
• Princess Miguel of Braganza (née Anita Rhinelander Stewart) on 15 September 1909
• Baroness Boris de Struve (née Eleanor Slater) on 27 November 1909
• Margaretta Finch-Hatton, Countess of Winchilsea and Nottingham (née Margaretta Armstrong Drexel) on 8 June 1910
• Lucie de Choiseul-Praslin, Duchess de Praslin (née Lucie Marie Tate, previously Paine) on 29 November 1910
• Alys Bingham, Lady Bingham (née Alys Elizabeth Carr, previously Chauncey) on 3 February 1911
• Helen Beresford, Baroness Decies (née Helen Vivien Gould) on 7 February 1911
• Marguerite Caetani, Princess di Bassiano, Princess di Teano and Duchess di Sermoneta (née Marguerite Gibert Chapin) on October 1911
• Princess Victor von Thurn und Taxis (née Lida Eleanor Nicolls, previously Fitzgerald) on 1 November 1911
• Mildred Stonor, Baroness Camoys (née Mildred Constance Sherman) on 25 November 1911
• Princess Napoleone Ruspoli (née Katherine Quay) on 14 October 1912
• Princess Michel Murat (née Helena McDonald Stallo) on 5 February 1913
• Elinor Chapelle de Jumilhac, Duchess de Richelieu (née Elinor Douglas Wise) on 8 February 1913
• Baroness Walther von Mumm (née Frances Von Bergen Scoville) on 3 June 1913
• Princess Alexis Karageorgevich (née Myra Abigail Pankhurst, previously Pratt) on 11 June 1913
• Princess Aymon de Faucigny-Lucinge (née Carolyn Salome Foster, previously Stickney) on 2 July 1913
• Princess Karl Rudolf von Croÿ, Duchess von Croÿ (née Nancy Leishman) on 27 October 1913
• Countess Franz von Dyhrn-Waldenburg, Baroness zu Schönau (née Florence Singer) in 1913
• Princess Francesco Luigi Giuseppe Rospigliosi (née Laura McDonald Stallo) on 30 June 1914
• Countess Gyula Apponyi de Nagy-Appony (née Gladys Virginia Steuart) on 29 July 1914
• Princess Christian von Hesse-Philippsthal-Barchfeld, Baroness von Barchfeld (née Elizabeth Reid Rogers) on 14 January 1915
• Princess Alexander Sapieha-Kodenski (née Elizabeth Hamilton Paine) on 15 March 1915
• Princess Ludovico Pignatelli de Aragón (née Ruth Morgan Waters) on 4 May 1915
• Countess Otto Viktor von Salm-Hoogstraeten (née Maud Coster) on 26 May 1915
• Countess Roger de Périgny (née Frances Evelyn "Fannie" Bostwick, previously Francis) on 17 August 1915
• Countess Kasimir Hyppolyt Zichy de Zich et Vásonykeő (née Julia May Moran) on 5 August 1916
• Princess Andrea Boncompagni-Ludovisi-Rondinelli-Vitelli, Marchioness di Bucine (née Margaret Preston Draper) on 25 October 1916
• Princess Alfred zu Hohenlohe-Waldenburg-Schillingsfürst (née Catherine Britton) on 14 December 1916
• Phyllis Brand, Baroness Brand (née Phyllis Langhorne) on 9 June 1917
• Countess Melchior de Polignac (née Nina Floyd Crosby, previously Eustis) on 24 October 1917
• Cécilia de Talleyrand-Périgord, Duchess de Montmorency (née Cecilia Ulman) on 14 November 1917
• Lady Alastair St. Clair Sutherland-Leveson-Gower on 27 April 1918, then Baroness George Osten-Driesen on 14 June 1931 (née Elizabeth Helene Demarest, previously Leishman)
• Countess Jacques de Pret (née Marion Barbara "Joe" Carstairs) on 7 January 1918
• Ava Lister, Baroness Ribblesdale (née Ava Lowle Willing, previously Astor) on 5 June 1919
• Countess Eugeniusz Dąmbski on 5 November 1919, then Princess Serge Mdivani on 14 May 1927 (née Apolonia Chałupiec, aka Pola Negri)
• Princess Anastasia of Greece and Denmark (née Nonie "Nancy" May Stewart, previously Leeds) on 1 January 1920
• Countess Alexandre de Saint-Phalle (née Helene Georgia Harper) on 6 April 1920
• Countess Jean de Maupas de Juglart (née Laura Consuelo Morgan) on 8 July 1920
• Mary Wallop, Countess of Portsmouth (née Mary Lawrence Post) on 31 July 1920
• Eleanor Stuart, Countess Castle Stewart (née Eleanor May Guggenheim) on 16 December 1920
• Gladys Spencer-Churchill, Duchess of Marlborough (née Gladys Marie Deacon) on 25 June 1921
• Edith Paget, Baroness Queenborough (née Edith Starr Miller) on 19 July 1921
• Countess Frédéric de Janzé (née Alice Silverthorne) on 21 September 1921
• Countess Jean-Bertrand de Luppé (née Sarah "Sally" Beecher) on 10 May 1922
• Countess Edward George Béla Zichy de Zich et Vásonykeő (née Charlotte Gardner Demarest) on 10 May 1922
• Princess Fabrizio Colonna (née Jeanne "Jeannie" Marie Beard Perkins) on June 1922
• Isabella Gordon, Marchioness of Huntly (née Charlotte Jane Isabella Fallon, previously MacDonald) on 26 June 1922
• Catherine Herbert, Countess of Carnarvon (née Anne Catherine Tredick Wendell) on 17 July 1922
• Gwendolyn Edmonstone, Lady Edmonstone (née Gwendolyn Mary Field) on 5 April 1923
• Dorothy Caracciolo, Princess di Cellamare, Duchess del Gesso and Duchess di Sant'Elia e di Schiavi (née Dorothy Adriance) in 1923
• Countess Ludwig von Salm-Hoogstraeten (née Mary Millicent Abigail Rogers) on 8 January 1924
• Countess Viggo af Rosenborg (née Eleanor Margaret Green) on 10 June 1924
• Valérie Pozzo di Borgo, Duchess Pozzo di Borgo (née Valerie Norrie) on 21 July 1924
• Princess Obolensky-Neledinsky-Meletzky on 24 July 1924, then Ava Hofmann, Edle von Hofmannsthal on 21 January 1933 (née Ava Alice Muriel Astor)
• Countess Pierre de Jumilhac (née Constance Coolidge) on 11 October 1924
• Philippa Stewart, Countess of Galloway (née Philippa Fendall Wendell) on 14 October 1924
• Princess Karl Rudolf von Croÿ, Duchess von Croÿ (née Helene Lewis) on 23 October 1924
• Margaret Caracciolo, Princess di Castagneto and Duchess di Melito (née Margaret Clarke) on 8 January 1925
• Gloria Le Bailly de La Falaise, Marchioness de La Coudraye (née Gloria May Josephine Swanson, previously Somborn) on 28 January 1925
• Princess Guido Pignatelli, Duchess di Montecalvo (née Constance Wilcox) on 28 August 1925
• Princess Eduard von Lobkowicz (née Anita Lihme) on 29 August 1925
• Princess Mstislav Galitzine, Countess Ostermann (née Amy "Aimée" Isabella Crocker, previously Miskinoff) on 22 September 1925
• Hon. Mrs Bede Clifford, Lady Clifford (née Alice Devin Gundry) on 21 October 1925
• Elsie Mendl, Lady Mendl (née Ella "Elsie" Anderson de Wolfe) on 10 March 1926
• Princess Mikhail Obolensky (née Kathleen Trask) on March 1926
• Countess Degenhart von Wurmbrand-Stuppach (née Lawton Filer) on 15 May 1926
• Thelma Furness, Viscountess Furness (née Thelma Morgan, previously Converse) on 27 June 1926
• Princess David Mdivani (née Marie Adrienne Koenig, aka Mae Murray) on 27 June 1926
• Princess Romanovskaya-Ilyinskaya on 21 November 1926, then Princess Dimitri Djordjadze on March 1937 (née Audrey Emery)
• Countess André-Marie de Saint-Phalle (née Jeanne Jacqueline Harper) on 7 June 1927
• Margaret Cuevas, Marchioness de Cuevas (née Margaret Rockefeller Strong) on 3 August 1927
• Princess Chlodwig zu Hohenlohe-Schillingsfürst von Ratibor und Corvey (née Mabel Heyward Maria Taylor, previously Cochran) on 21 September 1927
• Princess Balthasar Gialma Odescalchi (née Elaine Daniels Wilcox) on 30 September 1927
• Princess Clemente Giambattista Francesco Rospigliosi (née Claire Weil) on 3 May 1928
• Princess Marguerite d'Orléans, Duchess de Nemours, de Vendôme et d'Alençon (née Margaret "Marguerite" Watson) on 24 September 1928
• Countess Folke Bernadotte, Countess af Wisborg (née Estelle Romaine Manville) on 1 December 1928
• Princess Heinrich XXXIII Reuss zu Köstritz (née Allene Tew) on 10 April 1929
• Baroness Istvan Thyssen-Bornemisza de Kászon et Impérfalva (née Elizabeth Clarkson) on 27 April 1929
• Princess Charles Murat (née Margaret Stuyvesant Rutherford) on 5 July 1929
• Princess Serge Mdivani (née Mamie Harris, aka Mary McCormic, previously Rankin) on 27 April 1931
• Princess Alexis Mdivani on 15 May 1931, then Princess Serge Mdivani on 8 February 1936 (née Louise Astor Van Alen)
• Constance Le Bailly de La Falaise, Marchioness de La Coudraye (née Constance Campbell Bennett, previously Plant) on 22 November 1931
• Marian Rospigliosi, Princess Rospigliosi, Princess di Castiglione and Duchess di Zagarolo (née Marian Adair Snowden) on 27 November 1931
• Princess Michael Lichnowsky (née Mildred Lucile Everett Withstandley) on 2 March 1932
• Elise de Béthune-Hesdigneul, Princess de Béthune-Hesdigneul (née Elise Cragin Kay) on 19 July 1932
• Raffaella FitzGerald, Duchess of Leinster (née Agnes Raffaella Kennedy, previously Van Neck) on 1 December 1932
• Countess Franz Ferdinand Romanus von Colloredo-Mannsfeld (née Mabel Bayard Bradley) on 3 October 1933
• Princess Nikolaï Engalitcheff (née Susanna "Suzanne" Egera Bransford, previously Delitch) on October 1933
• Mimi Howard, Countess of Suffolk and Berkshire (née Mimi Forde-Pigott, aka Mimi Crawford) on 7 March 1934
• Countess Kurt von Haugwitz-Reventlow on 14 May 1935, then Princess Igor Troubetzkoy on 1 April 1947, then Baroness Gottfried von Cramm on November 1955 (née Barbara Woolworth Hutton)
• Elizabeth Beresford, Baroness Decies (née Elizabeth Wharton Drexel) on 25 May 1936
• Dorothy Beatty, Countess Beatty (née Dorothy Rice Power, previously Hall) on 21 April 1937
• Henrietta Pignatelli, Princess Pignatelli and Duchess di Montecalvo (née Henrietta Guerard Pollitzer, previously Hartford) in 1937
• Wallis Windsor, Duchess of Windsor (née Bessie Wallis Warfield, previously Simpson) on 3 June 1937
• Princess Alexis Zalstem-Zalessky (née Evangeline Johnson, previously Stokowski) on 7 February 1938
• Princess Artchil Gourielli-Tchkonia (née Chaya Rubinstein, aka Helena Rubinstein) on June 1938
• Countess Hans Christoph von Seherr-Thoss (née Marian Kingsland) on June 1938
• Princess Alexis Obolensky (née Jane Wheeler Irby, previously Lihme) on 6 January 1939
• Hon. Mrs Cecil John Arthur Howard (née Frances Dean, aka Frances Drake) on 12 February 1939
• Princess Ludwig della Torre e Tasso (née Frances Goodyear) on 18 June 1939
• Princess Andrei Gagarin (née Jamie Porter) on 22 July 1939
• Princess Alexander zu Hohenlohe-Waldenburg-Schillingsfürst (née Margaret "Peggy" Boyce Schulze) on 14 October 1939
• Joséphine de Crussol, Duchess d'Uzès (née Josephine Angela) on 18 November 1940
• Princess Vladimir Eristavi-Tchitcherine (née Lucy Cotton, previously Magraw) in 1941
• Princess Sergei Troubetzkoy (née Dorothy Livingston Ulrich) on 25 December 1941
• Princess Sergei Gagarin (née Frances Wickham "Patty" Moore) on 22 September 1942
• Kathleen Cavendish, Marchioness of Hartington (née Kathleen Agnes "Kick" Kennedy) on 6 May 1944
• Princess David Mdivani (née Virginia Sinclair) on 17 September 1944
• Rita Beatty, Countess Beatty (née Dorothy Rita Furey) on 7 February 1946
• Princess Dominik Rainer Radziwiłł (née Lida Lacey Bloodgood) on 8 January 1947
• Countess Kurt von Haugwitz-Reventlow (née Margaret Astor Drayton) on 30 July 1947
• Princess John de Braganza (née Winifred Dodge Seyburn) on 21 May 1948
• Mary Ponsonby, Countess of Bessborough (née Mary Munn) on 29 September 1948
• Barbara Pignatelli, Princess Pignatelli and Duchess di Montecalvo (née Barbara Eastman) on 14 October 1948
• Carroll Cabeza de Vaca, Marchioness de Portago (née Carroll McDaniel) in 1949
• Princess George Troubetzkoy (née Mary Stranahan) on 13 September 1949
• Princess Ivan Obolensky (née Claire Elizabeth McGinnis) on 10 October 1949
• Romaine Mountbatten, Marchioness of Milford Haven (née Romaine Dahlgren Pierce, previously Simpson) on 4 February 1950
• Princess Peter Gagarin (née Nancy Emma Tyner) on 27 May 1950
• Princess Alexander zu Hohenlohe-Waldenburg-Schillingsfürst (née Patricia Anne "Honeychile" Wilder, previously Cernadas) on 21 May 1951
• Adelle Beatty, Countess Beatty (née Adelle Dillingham, previously O'Connor) on 5 July 1951
• Virginia Ogilvy, Countess of Airlie (née Virginia Fortune Ryan) on 23 October 1952
• Baroness Philippe de Rothschild (née Pauline Fairfax Potter, previously Leser) on 8 April 1954
• Countess Albrecht von Bismarck-Schönhausen (née Mona Travis Strader, previously Williams) on 5 January 1955
• Baroness Hubert von Pantz (née Teresa "Terry" ???, previously McConnell) on June 1955
• The Princess of Monaco (née Grace Patricia Kelly) on 19 April 1956
• Esther de La Rochefoucauld, Duchess de Doudeauville (née Esther Millicent Clarke) on 5 February 1957
• Princess Balthasar Gialma Odescalchi (née Aida Burhans Canniff) on 17 April 1957
• Princess Alfred von Auersperg (née Martha Sharp Crawford, aka "Sunny" von Bülow) on 20 July 1957
• Princess Stanisław Albrecht Radziwiłł (née Caroline Lee Bouvier, previously Canfield) on 19 March 1959
• Princess Charles-Auguste d'Arenberg, Duchess d'Arenberg on 6 February 1960, then Duchess d'Uzès on 5 July 1968 (née Margaret "Peggy" Wright Bedford)
• Princess Andrew Romanov (née Kathleen Norris, previously Roberts) on 21 March 1961
• Countess Philippe Lannes de Montebello (née Edith Myles) on 24 June 1961
• Baroness Manuel von Pereira-Arnstein on 15 January 1962, then Countess André Stenbock-Fermor on 24 November 1967 (née Maria Mafalda Teresa Chanler)
• Princess Joan of Luxembourg on 1 March 1967, then Duchess de Mouchy on 3 August 1978 (née Joan Douglas Dillon, previously Moseley)
• Eliza Moore, Viscountess Moore (née Eliza Lambert Lloyd) on 15 May 1968
• Princess Obolensky-Neledinsky-Meletzky (née Marilyn Fraser Wall) on 3 June 1971
• Victoria de Rothschild, Lady de Rothschild (née Victoria Lou Schott) on 1 July 1973
• Elizabeth Cubitt, Baroness Ashcombe (née Mary Elizabeth Chipps, previously Dent-Brocklehurst) on 29 March 1979
• Princess Michael William de Braganza (née Barbara Haliburton Fales) on 27 September 1980
• Jamie Haden-Guest, Baroness Haden-Guest (née Jamie Lee Curtis) on 18 December 1984
• Diane Thatcher, Lady Thatcher (née Diane Burgdorf) on 14 February 1987
• Countess Carl-Eduard von Bismarck-Schönhausen (née Laura Elena Herring Martínez) on 27 February 1987
• Marie-Chantal, Crown Princess of Greece (née Marie-Chantal Miller) on 1 July 1995
• Princess Alexander von Fürstenberg (née Alexandra Natasha Miller) on 28 October 1995

These are some other major American heiresses, living and past :

Amanda Hearst, great-granddaughter of William Randolph Hearst

Cindy McCain, wife of presidential nominee John McCain and heiress of Hensley & Co. company

• Aline Barnsdall
• Susan Alice Buffett
• Lisa Brennan-Jobs
• Nancy Cunard
• Aileen Getty
• Florence Harding
• Amanda Hearst
• Anne Hearst
• Lydia Hearst-Shaw
• Patty Hearst
• Nicky Hilton
• Paris Hilton
• Brooke Hogan
• Teresa Heinz Kerry
• Kate Macy Ladd
• Cindy McCain
• Marie-Christophe de Menil
• Jacqueline Kennedy Onassis
• Olivia Palermo
• Kyra Sedgwick
• Edie Sedgwick
• Gloria Vanderbilt
• Grace Vanderbilt
• Flora Payne Whitney
• Gertrude Vanderbilt Whitney
• Olivia Wilde

Fictional American heiresses

• Alexis Colby, Fallon Carrington Colby, Amanda Carrington, Krystle Carrington and Dominique Deveraux on the TV series Dynasty
• Pam Ewing, April Stevens Ewing, Ann Ewing, Sue Ellen Ewing, Valene Ewing and Lucy Ewing on the TV series Dallas
• Constance Weldon Carlyle (portrayed by Morgan Fairchild) in the primetime television soap opera Flamingo Road
• Angela Channing (portrayed by Jane Wyman) in the primetime television soap opera Falcon Crest
• Sue Ellen Mischke (portrayed by Brenda Strong) in the sitcom Seinfeld
• Mary Beth, Andrew Van de Kamp's friend (portrayed by Ashley Austin Morris) on the television series Desperate Housewives
• Stephanie Forrester, Pamela Douglas, Felicia Forrester, Steffy Forrester, Phoebe Forrester, Brooke Logan, Taylor Forrester, Caroline Spencer and Caroline Spencer Forrester in the TV soap opera The Bold and the Beautiful
• Mackenzie Browning, Gloria Abbott Bardwell, Jill Foster Abbott, Darla Forrester and Katherine Chancellor in the TV soap opera The Bold and the Beautiful
• Helen Thermopolis in the novel and film The Princess Diaries (portrayed by Caroline Goodall)
• Cora Crawley (portrayed by Elizabeth McGovern) on the British period drama TV series Downton Abbey

Sources

• Paul Theroff's Online Gotha.
• The Peerage