Ernesta Legnani Bisi (June 18, 1788 – November 13, 1859) was an Italian painter and engraver.

Born in Milan, she became a student of the Brera Academy, where she studied under the direction of Giuseppe Longhi.

In 1811 she married Giuseppe Bisi from Genoa, a painter and professor of the Academy, by whom she had five children.

She was a strong supporter of Italian independence, and a friend of many women of the Carbonari (the so-called charcoal burners), such as the painter Bianca Milesi.

In the field of engraving on copper she reproduced five works of Francesco Francia, Marco d'Oggiono, Giacomo Cavedone, Palma il Giovane and Paris Bordone for the Pinacoteca di Brera in Milan, and the portraits of Maria Gaetana Agnesi, Vittoria Colonna and Giovanni Battista Monteggia for the Lives and portraits of illustrious Italians.