Tarquinia Molza (1 November 1542 – 8 August 1617) was an Italian singer, poet, conductor, composer, and natural philosopher. She was considered a great virtuosa. She was involved with the famous Concerto delle donne, although whether she sang with them or coached them is not clear. She also played the viola bastarda.
Molza was born in Modena, the granddaughter of the poet , and the daughter of Camillus and Isabella Colombi. Her father agreed that she should have the same education as her brothers, and she learned Greek, Latin, Hebrew, and philosophy until she was sixteen. She studied with the scientist John Politiano and the poet Francis Patrizio, and learned astronomy from the mathematician Antony Guarini. She married Paolo Porrino in 1560, who supported her returning to school, where she studied with Francesco Patrizi. She was widowed by 1579.
By 1583 she was living in Ferrara in the official capacity of lady-in-waiting to Duchess Margherita Gonzaga d'Este, where she was a famous performer, conductor, and composer. Molza was dismissed from her position in 1589 and returned to Mantua when she was accused of having an affair with Flemish composer Giaches de Wert. Minor nobility (as ladies-in-waiting to the duchess were considered) were not to involve themselves with members of the servant class (as minor composers such as Wert were considered). She claimed that her relationship with Wert was a friendship, and not sexual.
Molza wrote poetry in Latin and Tuscan dialect; she also wrote essays.
Many artistic works were dedicated to her; Francesco Patrizi wrote about her singing in his treatise L'amorosa filosofia, and she was perhaps the first singer to have a published biography dedicated to her (Opuscoli inediti di Tarquinia Molza modenese by D. Vandelli).
Her name appears among those on the Heritage Floor of Judy Chicago's The Dinner Party.