(1607-1665) was an Italian painter active in Baroque Lombardy and Piedmont.
He was born and died in Milan. It is not known where he obtained his early training though he is strongly influenced by the circle of il Morazzone, in works such as the Saint Teresa altarpiece in the Certosa di Pavia.
In 1633, Cairo moved to Turin to work as a court painter, including portraits, to Vittorio Amedeo I of the House of Savoy. Between 1637-1638, Cairo travelled to Rome, where he encounters the works of Pietro da Cortona, Guido Reni and of the Caravaggisti. He returns to Lombardy to complete altarpieces for the Certosa of Pavia and a church at Casalpusterlengo. He painted a St. Theresa for San Carlo in Venice. Between 1646-1649, he returns to Turin, and paints an altarpiece for Savigliano and the church of San Salvario. He is also known as Il Cavaliere del Cairo, because in Turin, he received the order of SS. Lazarus and Maurice in recognition of his merit.
Many of his works are eccentric depictions of religious ecstasies; the saints appear liquefied and contorted by piety. He often caps them with exuberant, oriental turbans.