Gachiani (Georgian: გაჩიანი) was a historical city and district in Lower Iberia/Kvemo Kartli in southeast Georgia.

The medieval tradition of Leonti Mroveli ascribes the foundation of Gachiani to an eponymous mythic lord, Gachios, son of Kartlos.

[1] The 10th-century Armenian historian Ukhtanes of Sebastia places Gachiani (Gajenaget) in what he refers to as the Plain of Georgians (Vrac' Dašt) and considers it to be a later name of the earlier town of Tsurtavi (C'urtaw).

[2] On the other hand, the early 18th-century Georgian scholar Prince Vakhushti locates Gachiani on the right bank of the river Ktsia.

The land of Gachiani was one of the marshlands between ancient Iberia (Georgia) and Armenia and changed its masters more than once in the course of history.