Immurement (from the Latin im-, "in" and murus, "wall"; literally "walling in"), also called immuration or live entombment, is a form of imprisonment, usually until death, in which someone is placed within an enclosed space without exits. This includes instances where people have been enclosed in extremely tight confinement, such as within a coffin. When used as a means of execution, the prisoner is simply left to die from starvation or dehydration. This form of execution is distinct from being buried alive, in which the victim typically dies of asphyxiation.

Notable examples of immurement as an established execution practice (with death from thirst or starvation as the intended aim) are attested. Women in the Roman Empire who were Vestal Virgins faced live entombment as punishment when they were found guilty of breaking their chastity vows. Immurement has also been well established as a punishment of robbers in Persia, even into the early 20th century. Some ambiguous evidence exists of immurement as a practice of coffin-type confinement in Mongolia. One famous immurement was that of Anarkali by Emperor Akbar because of her illicit relationship with Emperor Jahangir.

However, isolated incidents of immurement, rather than elements of continuous traditions, are attested or alleged from numerous other parts of the world as well, and some of these notable incidents are included. Instances of immurement as an element of massacre within the context of war or revolution are also noted. Entombing living persons as a type of human sacrifice is also reported, for example, as part of grand burial ceremonies in some cultures.

As a motif in legends and folklore, many tales of immurement exist. In the folklore, immurement is prominent as a form of capital punishment, but its use as a type of human sacrifice to make buildings sturdy has many tales attached to it as well. Skeletal remains have been, from time to time, found behind walls and in hidden rooms and on several occasions have been asserted to be evidence of such sacrificial practices or of such a form of punishment.