Francesco Brunacci (September 19, 1640 - November 6, 1703) was an Italian astronomer, philosopher, and mathematician. Born in the Marche region, he studied law in Macerata and then moved to Rome to begin a legal career. His attentions soon turned to mathematics and astronomy, and he studied with the monk Placido de Titi, an accomplished scholar of his time. He and his associate Francesco Maria Onorati reprinted Placido de Titi's work, but also improved deficiencies in it relating to the motion of celestial bodies. He is best known for his celestial chart 'Planisfero del Globo Celeste Artico Antartico,' which appeared in a 1687 atlas published by Giovanni Giacomo de Rossi.