Modesto Faustini was an Italian painter.

Faustini was born in Brescia. He was initially trained as a carpenter in the orphanage of Brescia, but then was able to win a scholarship at the Brera Academy where he studied under Tosio Martinengo. In 1869, he was awarded a stipend from the Brescia Town Council and moved to Rome.

Faustini painted mostly religious scenes. His most prominent works are St Francis of Assisi (1877); The Love of the Angels (1875); and a painting of Saints Cecilia, Caterina and Lucia (c. 1863).

In Milan he painted two medallions under the portico of Palazzo Brera. His paintings are also present in the Pacheco Chapel in Buenos Aires and the Spanish Chapel in the Basilica of the Holy House in Loreto.

Faustini passed away in Rome in 1981.