This open educational resource (OER) provides foundational information about Holocaust education and mass atrocity prevention, which aim to promote empathy and understanding, encourage critical thinking, foster a sense of collective responsibility, and increase cultural awareness. Learning about these events, OER users (e.g., students) can develop empathy for victims and survivors, gain a better understanding of the complexities of human behavior, and think critically about the causes and consequences of these atrocities. By allowing students to examine the societal, political, and cultural factors that contributed to these events and understand how individuals, governments, and institutions failed to prevent them, this OER can help foster a sense of responsibility in students and encourage them to consider their own role in promoting social justice and preventing future mass atrocities.