This book examines proclivity to genocide in the protracted killings that have continued for decades in the northern Nigeria ethnoreligious conflict spanning from the 1966 northern Nigeria massacres of thousands of Ibos up to the present ongoing killings between extremist Muslims and Christians or nonMuslims in the region. It explores the ethnic and religious dimensions of the conflict over five phases to investigate genocidal proclivity to the killings and the extent to which religion foments and escalates the conflict. This book adopts a conceptual analytic approach of establishing similarity of genocidal patterns to the northern Nigeria ethnoreligious conflict by examining genocidal occurrences and massacres in history particularly the twentiethcentury contemporary genocides for an understanding of genocide. With this reference frame the study structures a Genocide Proclivity Model for identifying inclinations to genocide and derives a substantive theory using the Strauss and Corbin 1990 approach. By identifying genocidal intent as underlying the various manifestations and causes of genocide in specific genocide cases the book establishes that genocidal proclivity or the intent to exterminate the other on the basis of religion andor ethnicity underlies most of the northern Nigerian episodic but protracted killings. The books analytic framework and approach are grounded in identifiable and provable evidences of specific intent to annihilate the other mostly involving extremist Muslims intent to cleanse northern Nigeria of Christians and other nonMuslims through the exclusionary ideology of imposition of the Sharia Law and to force assimilation or extermination through massacres and genocidal killings of those who refuse to assimilate or adopt the Muslim ideology. The study establishes that the genocidal inclinations to the conflict have remained latent because of the intermittent but protracted nature of the killings and lends credence to the conception of genocid