Italian painter, the chief Italian representative of the Classical style (Classicism and Neoclassicism) in the 17th-century painting of Rome.

Sacchi was trained under Francesco Albani at Bologna. After returning to Rome in 1621 he worked there until his death, except for short visits to northern Italy after 1635 and to Paris in 1640.

His Bolognese training gave him an initial bias toward Classicism and a taste for colour. But the direct influence of Raphael was already added to these qualities in the “Miracle of St. Gregory” (1625–27; Vatican Museum, Rome). This work brought Sacchi to the notice of the Sacchetti family, who employed him, with Pietro da Cortona, in the decoration of their villa at Castel Fusano in 1627–29. Both artists were next employed by Antonio Cardinal Barberini to decorate the Palazzo Barberini in Rome. Sacchi's ceiling fresco, “Allegory of Divine Wisdom” (1629–33), is a grave, static work, markedly Raphaelesque in conception and containing relatively few figures, in contrast with Cortona's full Baroque “Triumph of Divine Providence” in an adjoining room. Sacchi's two altarpieces in Santa Maria della Concezione, Rome (1631–38), are likewise distinguished from the other pictures in the church by their Classicism. His most important work after the “Divine Wisdom” is the series of eight canvases illustrating the life of St. John the Baptist in the cupola of the Baptistery of St. John, Rome (1639–45). Sacchi painted a few portraits but concentrated mainly on religious works.