Eugenia Attendolo Bolognini (1837–1914), styled by marriage as duchessa Litta Visconti Arese, was an Italian noblewoman, philanthropist and hostess of a famous literary salon in Milan.
She was for a time a lady-in-waiting to the Queen of Italy, Margherita of Savoy. She is most known for her love affair with King Umberto I of Italy, which lasted from the time of his marriage in 1868 until his death in 1900.
Attendolo Bolognini was the daughter of Conte Giovanni Giacomo Bolognini Attendolo (1797-1865) and Contessa Eugenia Vimercati.
She married Giulio Litta Visconti Arese in 1855 and had 2 children, Pompeo (1856-1921) and Alfonso (1870-1891). She is also most known for her love affair with King Umberto I of Italy, whichlasted from his marriage until his death.