The Small Arms Survey (SAS) is an independent research project located at the Graduate Institute of International and Development Studies in Geneva, Switzerland. It provides information on all aspects of small arms and armed violence, as a resource for governments, policy-makers, researchers, and activists, as well as research on small arms issues.

A firearm is any type of gun that uses an explosive charge and is designed to be readily carried and used by an individual. The term is legally defined further in different countries.