Baroness Helene von Vetsera (née Baltazzi; 1847 – 1 February 1925) was an Austrian noblewoman and socialite.

She was the daughter of a wealthy lawyer and financial advisor, and she married Albin Freiherr von Vetsera in 1864.

She enjoyed significant prestige in the social life of Vienna until she was disgraced by the Mayerling incident in 1889, when her daughter Baroness Mary von Vetsera and Crown Prince Rudolf were found dead together.

[1] Her father was a lawyer from a Venetian–Greek family,[2] and he had made a fortune working as the financial advisor for Sultan Abdulmejid I in Constantinople.

Austria underwent severe hyperinflation after World War I, and Helene von Vetsera lost her fortune.