Hyperthymic temperament, or hyperthymia, from Ancient Greek ὑπέρ ("over", meaning here excessive) + θυμός ("spirited"), is a proposed personality type characterized by an exceptionally, or in some cases, abnormally positive or irritated mood and disposition.

It is generally defined by increased energy, vividness and enthusiasm for life activities, as opposed to dysthymia.

Studies have suggested that hyperthymic temperament may be associated with efficient performance of complex tasks under time pressure or extreme conditions.

[7] Despite this positive characterization, hyperthymia can be complicated with depressive episodes manifesting as a softer form of bipolar illness, such as cyclothymia.

[10] Aside from references in historical and more recent writings on the spectrum of mood disorders, further literature on the temperament is lacking.