Sacrilege is the violation or injurious treatment of a sacred object, site or person. This can take the form of irreverence to sacred persons, places, and things. When the sacrilegious offence is verbal, it is called blasphemy, and when physical, it is often called desecration. In a less proper sense, any transgression against what is seen as the virtue of religion would be a sacrilege, and so is coming near a sacred site without permission.

Most ancient religions have a concept analogous to sacrilege, often considered as a type of taboo. The basic idea is that realm of sacrum or haram stands above the world of profanum and its instantiations, see the Sacred–profane dichotomy.