In religion and theology, revelation is the revealing or disclosing of some form of truth or knowledge through communication with a deity or other supernatural entity or entities.

Some religions have religious texts which they view as divinely or supernaturally revealed or inspired. For instance, Orthodox Jews, Christians and Muslims believe that the Torah was received from Yahweh on biblical Mount Sinai. Most Christians believe that both the Old Testament and the New Testament were inspired by God. Muslims believe the Quran was revealed by God to Muhammad word by word through the angel Gabriel (Jibril). In Hinduism, some Vedas are considered apauruṣeya, "not human compositions", and are supposed to have been directly revealed, and thus are called śruti, "what is heard". The 15,000 handwritten pages produced by the mystic Maria Valtorta were represented as direct dictations from Jesus, while she attributed The Book of Azariah to her guardian angel. Aleister Crowley stated that The Book of the Law had been revealed to him through a higher being that called itself Aiwass.