The phenomena of mass shootings appear to be on the rise. Within the past decade, shootings have occurred in schools, religious institutions, concerts, movie theaters, and other public venues, as well as at home in the form of domestic mass shootings. This phenomenon is influenced by factors such as access to guns, mental illness, the desire for fame, revenge from being bullied, and copycat killing to name a few. Mass shootings are a serious problem for society and must be explored further in order to provide preventive solutions. The Handbook of Research on Mass Shootings and Multiple Victim Violence is a pivotal reference source that provides vital research on contributing factors to gun violence, characteristics of shooters and victims, solutions for preventing incidents from occurring, and the impact these shootings have on the community. While highlighting topics such as school safety, cyberbullying, and mental illness, this publication is ideally designed for law enforcement, government officials, psychologists, psychiatrists, sociologists, politicians, policymakers, law makers, academicians, researchers, and students seeking current research on the latest empirical findings of mass shootings in the United States.