
A liminal deity is a deity in mythology who presides over thresholds, gates, or doorways; "a crosser of boundaries". In Hindu traditions, liminal deities are also associated with tirthas, or holy crossing places, which function as spiritual thresholds in physical geography. These sites—often river fords, pilgrimage crossings, or transitional boundary zones—are linked to multiple gods and serve as sacred locations where the earthly and divine realms intersect. These gods are believed to oversee a state of transition of some kind; such as, the old to the new, the unconscious to the conscious state, the familiar to the unknown.
Types of liminal deities include dying-and-rising deities, various agricultural deities, psychopomps and those who descend into the underworld: crossing the threshold between life and death. Vegetation deities mimic the annual dying and returning of plant life, making them seasonally cyclical liminal deities in contrast to the one-time journey typical of the dying-and-rising myth. Anthropologist Victor Turner expanded the modern theoretical understanding of liminality by emphasizing the role of shamans, guides, and ritual specialists who facilitate transitions between states of being. These ritual figures occupy liminal positions themselves and mirror mythological deities who guide individuals across cosmic or social thresholds.
The word liminal, first attested to in English in 1884, comes from the Latin word limen, meaning 'threshold'. Liminality is a term given currency in the twentieth century by British cultural anthropologist Victor Turner. It is used to describe a state of transition; such as from the old to the new, from the familiar to the unknown, even from an unconscious to the conscious state.

Most liminal deities usually travel or cross the boundaries of all worlds, including the physical, metaphysical and even conceptual. They can act as psychopomps or as gatekeepers. For example, the Greek messenger god Hermes was known to be a psychopomp acting as a guide for dead souls to the underworld, as was the goddess Hecate. Some liminal deities even embody the concept of liminality or rites of passage. For example, the Roman two-faced god Janus was known to embody the concept of duality and transitions, such as the beginning and ending of the new year. Their role is not always to interact or cross the boundaries of cosmos, but also to keep limits to them or everything else so there can be a balance between the worlds. Some liminal deities also function as spiritual guardians of boundaries, crossroads and other liminal spaces such as village boundaries, doorways, cremation grounds and life passages..


