A halo (from Ancient Greek ἅλως  'threshing floor, disk'; also called a nimbus, aureole, glory, or gloriole is a crown of light rays, circle or disk of light that surrounds a person in works of art. The halo occurs in the iconography of many religions to indicate holy or sacred figures, and has at various periods also been used in images of rulers and heroes. In the religious art of Ancient Greece, Ancient Rome, Christianity, Hinduism, and Buddhism, sacred persons may be depicted with a halo in the form of a circular glow, or flames in Asian art, around the head or around the whole body—this last form is often called a mandorla. Halos may be shown as almost any colour or combination of colours, but are most often depicted as golden, yellow or white or as red.

An aureola or aureole is the radiance of luminous cloud which, in paintings of sacred personages, surrounds the whole figure.