Zaganos or Zagan Pasha was an Ottoman military commander, with the titles and ranks of kapudan pasha and the highest military rank, grand vizier, during the reign of Sultan Mehmed II "the Conqueror". Originally a Christian, who was conscripted and converted through the devşirme system, he became a Muslim and rose through the ranks of the janissaries. He became one of the prominent military commanders of Mehmed II and a lala – the sultan's advisor, mentor, tutor, councillor, protector, all at once. He removed his rival, the previous Grand Vizier Çandarlı Halil Pasha the Younger, amid the fall of Constantinople. He later served as the governor of Thessaly of Macedonia.