Ethereal beings, according to some belief systems and occult theories, are mystic entities that usually are not made of ordinary matter. Despite the fact that they are believed to be essentially incorporeal, they do interact in physical shapes with the material universe and travel between the mystical and the everyday world. Given the lack of scientific evidence of their existence, science does not acknowledge as factual, though paranormal researchers and psychics claim them as real.

Several belief systems include ethereal beings such as ghosts, mythological entities, nature spirits, angels, thoughtforms, jinns,^[1][2] and they are mentioned in religious, folkloristic, and magic texts. Since the nineteenth century, the existence of ethereal beings was being claimed by various spiritualist philosophies as well, and they are found in the popular imagination and represented in movies, TV series and cartoons.