Cihangirzade İbrahim Bey (1874–1948), known as İbrahim Aydın after the 1934 Surname Law in Turkey, although he is more commonly called under the name he was known prior to the law) was an Azerbaijani-Turkish military officer, statesman, and administrator who served the Ottoman Empire and after its defeat in World War I, became the leader of the Turkish revolutionaries in his native Kars and in southwest Caucasia. After the Armistice of Mudros, he led the First Congress of Ardahan, establishing a local administration, and was later declared the head of the Southwest Caucasian National Resistance Government on 5 November 1918. This movement took control of the cities of Kars, Ardahan, and Batum in late 1918.