Unipolar may refer to:
Electronics Unipolar generator, a DC electrical generator Unipolar stepper motor, a type of small DC electric motor Unipolar transistor, transistors that involve single-carrier-type operation
Science and medicine Unipolar depression or major depressive disorder Unipolar mania, an uncommon mental disorder that causes manic episodes without any history of depression Unipolar neuron, a neuron with a single neurite
Other uses Unipolar encoding, a line code Unipolarity, a distribution of power in international relations in which one state exercises most of the cultural, economic, and military influence