Extraterrestrial may refer to any object or being beyond (extra-) the planet Earth (terrestrial). It is derived from the Latin Root extra ("outside", "outwards") and terrestris ("earthly", "of or relating to the Earth").
It may also refer to:
- Extraterrestrial life, in scientific context, hypothetical life that exists outside Earth
- Extraterrestrials in fiction
- Extraterrestrial (film), 2012 film by Nacho Vigalondo
- Extraterrestrial (TV program), a program on the National Geographic Channel
- Outer space, the location of things that are "outside Earth"
- E.T. the Extra-Terrestrial, 1982 film by Steven Spielberg
- E.T. (song), song by Katy Perry