Feyzullah Mirza Qajar (Russian: Фейзулла Мирза Каджар; Persian: فیض الله میرزا قاجار; Azerbaijani: Feyzulla Mirzə Qacar) also Fazullah-Mirza Qajar (Russian: Фазулла-Мирза-Каджар; Persian: فضل الله میرزا قاجار) (b. December 15, 1872 - d. 1920) - was a prince of Persia's Qajar dynasty and a decorated Imperial Russian and Azerbaijani military commander, holding the rank of Major-General.

After graduating from college in the 1st category, he was released on August 7, 1893 as a cornet to the 43rd Tver Dragoon Regiment.

After the outbreak of the Russo-Japanese War, then the staff captain of the 43rd Tver Dragoon Regiment, Feyzulla was transferred at the end of March 1904 to the 2nd Dagestani Horse Regiment and put under command of Colonel Huseyn Khan Nakhchivanski.

Towards end of the war, on March 21, 1906 he was appointed rittmeister and returned to the 43rd Tver Dragoon Regiment.

From June 19 to 28, he was at the headquarters of the Caucasian Cavalry Division "to examine health for being reckoned with the Emperor Alexander I's Committee on the wounded."

On May 17, 1917, he was promoted to major general, and on May 30 he was appointed commander of the 2nd Brigade of the Caucasian Native Cavalry Division.

According to the Azerbaijani historian Shamistan Nazirli, after the Sovietization of Azerbaijan and the suppression of the anti-Soviet uprising in Ganja, Feyzulla Mirza Qajar was arrested, taken to Baku and executed by the Bolsheviks on the island of Nargin.