In this article, the authors use the Israeli-Palestinian conflict as an example of ostensibly intractable ethnonational conflict and examine the psychological dynamics that contribute to its intractability. They review the unique characteristics of this conflict and the clash of narratives. They argue that some ethnonational conflicts have characteristics that increase their resistance to change and that societies in such conflicts form societal beliefs that, on the one hand, help them cope with the stressful conditions of the conflicts but, on the other hand, perpetuate the conflicts. Finally, they discuss some social psychological contributions to changing societal beliefs as a way of intervening in such conflicts.