Extraterrestrial may refer to any object or being beyond the planet Earth. It is derived from the Latin extrus ("outside", "outwards") and terrestris ("earthly", "of or relating to the Earth"). Specific references include:

• Extraterrestrial life, hypothetical life that exists outside of Earth
• Extraterrestrial (TV program), a show on the National Geographic Channel
• A book, A Field Guide for Earthlings
• Extraterrestrial life in culture