Francesco Chieregati (1479, Vicenza – 6 December 1539, Bologna) was a papal nuncio and bishop.
Sent by Pope Leo X as papal nuncio to England (1515–17), he also filled a similar office in Portugal and in Spain (1519), becoming acquainted with Cardinal Adrian Florent, Bishop of Tortosa, the Dutch preceptor of Charles V, and later Pope Adrian VI.
One of Pope Adrian's first acts, after his entry into Rome, was to make Chieregati, whose learning and virtue the pope esteemed, Bishop of Teramo in the Kingdom of Naples; he then sent him to the Diet of Nuremberg, called for the autumn of 1522. He was commissioned to obtain from the German princes a more energetic pursuit of the war against the Turks in Hungary, also a more vigorous suppression of Lutheranism and the execution of the Edict of Worms (26 May 1521) against Martin Luther. In two discourses (19 November and 10 December) he urged the princes to co-operate for the expulsion of the Turks from Christian Hungary; on the latter date he also demanded the immediate execution of the Edict of Worms, whereby Luther had been put under the ban of the empire, which formal outlawry he had hitherto escaped through the protection of Frederick of Saxony and other friendly princes. Finally, on 3 January 1523, Chieregati read publicly two important documents, sent after him from Rome. They were a papal brief (issued on the previous 25 November) to the members of the Diet and an instruction for Chieregati himself. The former contained an appeal to the Catholic piety, religious traditions, and magnanimity of the representatives of the German people, and besought the Diet to quench religious sedition and compel the submission of Luther and his adherents.