Broad objective of this article is to define and discuss on Frontier Justice. Frontier Justice means the lack of any law enforcement authority in the western territories was an issue. A variety of exclusive and public police crammed the void. Here analysis various types of Frontier Justice like Vigilantes, Sheriffs, State police and U.S. Marshals. This article explain all Frontier Justice with explain. Vigilante committees were derived from citizens who arrested, tried using, convicted, and punished people.