Köprülü Mehmed Pasha, Ottoman politician, 109th Grand Vizier of the Ottoman Empire (born 1575)

Köprülü Mehmed Pasha was Grand Vizier of the Ottoman Empire and founding patriarch of the Köprülü political dynasty. He helped rebuild the power of the empire by rooting out corruption and reorganizing the Ottoman army. As he introduced these changes, Köprülü also expanded the borders of the empire, defeating the Cossacks, the Hungarians, and most impressively, the Venetians. Köprülü's effectiveness was matched by his reputation.

The grand vizier of the Ottoman Empire was the de facto prime minister of the sultan in the Ottoman Empire, with the absolute power of attorney and, in principle, removable only by the sultan himself in the classical period, before the Tanzimat reforms, or until the 1908 Revolution. He held the imperial seal and could summon all other viziers to attend to affairs of the state in the Imperial Council; the viziers in conference were called "kubbe viziers" in reference to their meeting place, the Kubbealtı ('under-the-dome') in Topkapı Palace. His offices were located at the Sublime Porte.