Monster Energy is an energy drink that was created by Hansen Natural Company in April 2002. As of 2022, Monster Energy had a 30.1% share of the American energy drink market, the second-highest after Red Bull.

An energy drink is a type of drink containing stimulant compounds, usually caffeine, which is marketed as providing mental and physical stimulation. They may or may not be carbonated and may also contain sugar, other sweeteners, or herbal extracts, among numerous other possible ingredients.