Enoplocerus is a genus of longhorn beetles in the subfamily Prioninae of the family Cerambycidae. It is monotypic, being represented by the single species Enoplocerus armillatus, commonly known as the giant longhorn beetle or imperious sawyer.
Enoplocerus armillatus exhibits strong sexual dimorphism and is one of the largest Cerambycids. Females reach a length of 70- and males 110-, but specimens up to have been captured. Males have impressive and large mandibles. This species is characterized by very long black antennae, pale brown elytra, quite thick forelegs, and four sharp spines on both sides of the prothorax. It has diurnal habits and it is frugivorous and attracted by tree exudates, while larvae are root borers, feeding on decaying materials.
Enoplocerus armillatus can be found from Costa Rica to Argentina and Brazil. It prefers dry or partially wet areas, at an elevation of about 0-.