Djevdet Bey, Jevdet Bey, Cevdet Tahir Belbez (? – January 15, 1955) was an Albanian Ottoman governor of the Van vilayet of the Ottoman Empire during World War I and the Siege of Van. He is considered responsible for the massacres of Armenians in and around Van. Clarence Ussher, a witness to these events, reported that 55,000 Armenians were subsequently killed. He is also considered responsible for massacres of Assyrians in the same region. In 1914, as the Kaymakam of the Sanjak of Hakkari, he worked closely together with the Ottoman Secret Service to coordinate the defense against the Russians and possible offensives against the region around Lake Urmia. He wrote to Talaat Pasha that Urmia could have been captured with some more support of his superiors. He succeeded Hasan Tahsin Bey as Go