Hubris (/ˈhjuːbrɪs/, also hybris, from ancient Greek ὕβρις) means, in a modern context, extreme pride or self-confidence; in its ancient Greek context, it typically describes violent and excessive behavior rather than an attitude. When it offends the gods of ancient Greece, it is usually punished. The adjectival form of the noun hubris is "hubristic".

Hubris is usually perceived as a characteristic of an individual rather than a group, although the group the offender belongs to may suffer consequences from the wrongful act. Hubris often indicates a loss of contact with reality and an overestimation of one's own competence, accomplishments or capabilities, especially when the person exhibiting it is in a position of power.