火刑，是死刑的一种，意即将犯人绑在柱上用火活活烧死。

在不同的文化中，火刑是常用的死刑之一。例如：古中国的炮烙；还有西方的中世纪到近代早期，异端裁判所用此方式处决死刑犯。

Deliberately causing death through the effects of combustion, or effects of exposure to extreme heat, has a long history as a form of capital punishment. Many societies have employed it as an execution method for activities considered criminal such as treason, rebellious actions by slaves, heresy, witchcraft and demonstrated sexual transgressions, such as incest or homosexuality. The best known type of executions of death by burning is when the condemned is bound to a large wooden stake. This is usually called burning at the stake (or, in some cases, auto-da-fé). But other forms of death resulting from exposure to extreme heat are known, not only by exposure to flames or burning materials. For example, pouring substances, such as molten metal, onto a person (or down their throat or into their ears) are attested, as well as enclosing persons within, or attaching them to, metal contraptions subsequently heated. Immersion in a heated liquid as a form of execution is reviewed in death by boiling.