Hero cults were one of the most distinctive features of ancient Greek religion. In Homeric Greek, "hero" (, ) refers to a man who was fighting on either side during the Trojan War. By the historical period, however, the word came to mean specifically a dead man, venerated and propitiated at his tomb or at a designated shrine, because his fame during life or unusual manner of death gave him power to support and protect the living. A hero was more than human but less than a god, and various kinds of supernatural figures came to be assimilated to the class of heroes; the distinction between a hero and a god was less than certain, especially in the case of Heracles, the most prominent, but atypical hero.

A hero (masculine or gender-neutral) or heroine (feminine) (, hḗrōs) is a person or main character of a literary work who, in the face of danger, combats adversity through impressive feats of ingenuity, bravery or strength, often sacrificing his or her own personal concerns for some greater good.

A hero is a person who performs extraordinary deeds for the benefit of others.