Non-human intelligent being

Note: For the immigration term, see en:alien (law) and/or alien (immigration)

An alien, space alien, or non-human intelligent being (NHIB) is a member of one or more species of beings other than humans on Earth and alleged non-terrestrial humans that are allegedly present in the universe.

Extraterrestrial humans are not NHIBs but are considered aliens. Hypothetically, subterranean humans might also be classified as aliens. NHIBs are allegedly most often extraterrestrial; however, some are cryptoterrestrials, or subterranean and/or interdimensional beings, and some may even come from the past or future. Many different species of NHIBs in many communities have been alleged.