Abstract: This study aimed to investigate the stability of some of internationally derived durum wheat varieties in the Southeastern Anatolia. The experimental data, collected from both rain fed and supplementary irrigated conditions in different locations of Southeastern of Anatolia in 1995/96,1996/97 and 1997/98 cropping seasons, were subjected to Additive Main Effects and Multiplicative Interactions (AMMI) stability assessment method. The results, obtained from AMMI analysis indicated that Aydin-93 and Ceylan-95 were the most responsive varieties. Harran-95 and Diyarbakir-81 both seemed to be stabile yielding varieties under both rain fed and supplementary irrigated conditions, while, Firat-93 was the least responsive variety, adapted to poor environmental conditions. It was concluded that several responsive and stabile yielding varieties have been developed adapting to a wide range of environments in the Southeastern of Anatolia.