Doğubayazıt (Armenian: Դարոյնք, Դարենից Kurdish: Bazîd or Bayizd) is a city and district of Ağrı Province of Turkey, and is Turkey's most eastern district, the border crossing to Iran. Elevation 1625 m. Area 2,383 km². Population (2010) 115,354 (up from 73,794 in 1980) of which 69,447 live in the town of Doğubeyazıt, the remainder in the surrounding countryside.

The town of Doğubayazıt is a settlement with a long history. It lies 15 km southwest of Mount Ararat, 93 km east of the city of Ağrı and 35 km from the Iranian border. The town stands on a plain surrounded by some of Turkey's highest peaks including: Ararat (5,137m), Little Ararat (3,896m), Tendürek Dağı (3,533m), Kaletepe (3,196m) Arıdağı (2,934m) and Göllertepe (2,643m).

The weather on the plain is hot and dry in summer, cold and dry in winter.