Isabella Leonarda (6 September 1620 – 25 February 1704) was an Italian composer from Novara. At the age of 16, she entered the Collegio di Sant'Orsola, an Ursuline convent, where she stayed for the remainder of her life. Leonarda is most renowned for the numerous compositions that she created during her time at the convent, making her one of the most productive woman composers of her time.

Anna Isabella Leonarda was born on September 6, 1620, the daughter of Giannantonio Leonardi and his wife, Apollonia. The Leonardi were an old and prominent Novarese family whose members included important church and civic officials and knights palatine. Isabella's father, who held the title of count, was a doctor of laws.[2]

In 1636, Leonarda entered the Collegio di Sant'Orsola, an Ursuline convent in Novara. Her family maintained close ties with Sant'Orsola as benefactors, which some speculate may have contributed to Leonarda's influence within the convent. She held various positions of authority throughout her time at Sant'Orsola - as madre (1676), superiora (1686), madre vicaria (1693), and consigliera (1700). The precise significance of these titles is unclear, but superiora was probably the highest office in the convent.[3]

Leonarda was a highly regarded composer in her home city, but her music was apparently little known in other parts of Italy. Her published compositions span a period of 60 years, beginning with the dialogues of 1640 and concluding with the Motetti a voce sola of 1700. Leonarda is credited with producing nearly two hundred compositions during that period, though her only works appearing before 1670 were the dialogues printed by Gasparo Casati. It appears that she was over the age of 50 before she started composing regularly, and it was at that time that she began publishing the works that we know her for today.