María Elena "Nelly" Arrieta de Blaquier (died 15 November 2020) was an Argentine sugar heiress, art collector and patron.
She was the only child of Herminio Arrieta, who worked at Ledesma, and his wife Paulina "Paulette" Wollmann, and Nelly became the sole heir to the Ledesma sugar company.
In 1951, she married Carlos Pedro Blaquier, and they had five children.
She chaired the Asociación Amigos del Museo Nacional de Bellas Artes (Friends of Museo Nacional de Bellas Artes (Buenos Aires)) from 1977 to 2011, and was honorary president until her death.
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