Ağa is a Turkish surname. Notable people with the surname include:
Mustapha Aga, Ottoman Empire ambassador to the Swedish CourtOsman Aga of Temesvar, Ottoman army officerSedefkar Mehmed Agha, Ottoman architect of the Sultan Ahmed MosqueSuleiman Aga, Ottoman Empire ambassador to the French king Louis XIVSilahdar Findiklili Mehmed Aga, Turkish historianYakup Ağa, Ottoman cavalry knightZaro Aga, claimed to be one of the longest-lived humans in the history of mankind