Athanasios Frangou or Frangos (Greek: Αθανάσιος Φράγκου/Φράγκος, 1864–1923) was a Hellenic Army officer who reached the rank of Major General.

He joined the Hellenic Army on 5 November 1883, and later enrolled in the NCO School, from where he graduated in 1893 as a Second Lieutenant of Infantry.

He was reinstated with the electoral defeat of Eleftherios Venizelos in November 1920 which brought the monarchist opposition to power, and assumed command of the 1st Infantry Division in Anatolia, where he led it in all the battles of the Greco-Turkish War of 1919–1922.

He played a crucial role during the collapse of the Greek front in the Battle of Dumlupınar in August 1922, trying to rally the collapsing Greek forces: he assumed command of the remainders of I and II Corps, forming them together in the so-called "Southern Group" and led their retreat towards Çeşme, where they embarked on ships for the islands of Chios and Lesbos.

Following the outbreak of the Venizelist-led 11 September 1922 Revolution among the surviving Army units, he was dismissed from service.