Aleksander Petrovich Reza Qoli Mirza Qajar (Russian: Александр Петрович Риза-Кули Мирза Каджар; Persian: الکساندر پتروویچ رضا قلی میرزا قاجار; 25 May 1869 – c. 4 May 1941) was a prince of Iran's Qajar dynasty, an Imperial Russian military leader and the commander of Yekaterinburg (1918), holding the rank of Colonel (Polkovnik).
The Qajar dynasty (Persian: دودمان قاجار, romanized: Dudemâne Ǧâjâr) is a formerly aristocratic (and from 1789-1925, royal) Iranian dynasty that gained prominence with the rise of Shahverdi Qajar in the early 16th century as heads of the Turkoman Qajar tribe of the Qizilbash confederacy. The dynasty ruled Iran from 1789 until 1925, upon the Unification of Iran (1779–1796) by Mohammad Khan Qajar (r. 1789–1797).
The Russian branch of the Qajar dynasty belonged to the Russian Nobility and were given the titles Prince Persidskii and Princess Persidskaya by the Tsar in the 19th century, of which many members had held high functions in the Imperial Russian Army, such as Aleksander Reza Qoli Mirza Qajar.