Ayran or doogh is a savory yogurt-based drink that is mainly associated with Iran and Türkiye, but it is enjoyed throughout the Middle East, and similar drinks are also found in India and the Balkans. The drink has ancient origins, and though it is impossible to pin its exact origin, it could have developed simultaneously in different parts of the world.

Doogh is made by mixing yogurt, cold (or ice) water, and salt. It is often combined with various herbs and spices—such as mint or pepper—but sometimes fruit or vegetables can also be added. It is also occasionally made as a carbonated drink.

Although they are very similar, Turkish ayran will have a thicker and creamier consistency, and it is usually served plain, while Iranian doogh appears to be more diluted and it often includes herbs or spices. This refreshing thirst-quencher is quickly whipped up at home, but commercially produced versions are very common.