Alex Peter Schmid is a scholar in terrorism studies, who from 1999 to 2005 was Officer-in-Charge of the Terrorism Prevention Branch of the United Nations Office on Drugs and Crime in Vienna. He is particularly known for his work on the definition of terrorism.

Terrorism, in its broadest sense, is the use of violence against non-combatants to achieve political or ideological aims. The term is used in this regard primarily to refer to intentional violence during peacetime or in the context of war against non-combatants. There are various different definitions of terrorism, with no universal agreement about it. Different definitions of terrorism emphasize its randomness, its aim to instill fear, and its broader impact beyond its immediate victims.