Hubris (; from Ancient Greek ὕβρις (húbris) 'pride, insolence, outrage'), or less frequently hybris (), describes a personality quality of extreme or excessive pride or dangerous overconfidence, often in combination with (or synonymous with) arrogance. The term arrogance comes from the Latin adrogare, meaning "to feel that one has a right to demand certain attitudes and behaviors from other people". To arrogate means "to claim or seize without justification... To make undue claims to having", or "to claim or seize without right... to ascribe or attribute without reason". The term pretension is also associated with the term hubris, but is not synonymous with it.

According to studies, hubris, arrogance, and pretension are related to the need for victory (even if it does not always mean winning) instead of reconciliation, which "friendly" groups might promote. Hubris is usually perceived as a characteristic of an individual rather than a group, although the group the offender belongs to may suffer collateral consequences from wrongful acts. Hubris often indicates a loss of contact with reality and an overestimation of one's own competence, accomplishments, or capabilities. The adjectival form of the noun hubris/hybris is hubristic/hybristic.

The term hubris originated in Ancient Greek, where it had several different meanings depending on the context. In legal usage, it meant assault or sexual crimes and theft of public property, and in religious usage it meant transgression against a god.