Orion most commonly refers to: Orion (mythology), a hunter in Greek mythology Orion (constellation), a constellation Orion Nebula, a nebula also known as M42 Orion Arm, the minor spiral arm of the Milky Way galaxy where the Earth's located Orion of Thebes, a 5th century grammarian Orion may also refer to: Space exploration Orion (spacecraft), a U.S. space capsule under development by NASA and Lockheed Martin Orion (U.S. rocket), an American sounding rocket Orion 1 and Orion 2 Space Ob… (More on Orion)