Arm of Orion, Orion's Arm or Orion Arm may refer to:
Orion Arm, a spur-spiral arm of the Milky Way Galaxy, where the Earth is located Constellation of Orion's arm Orion's Arm or Orion's Arm Universe Project, a science fiction world building project established in 2000 Orion-Asteroid Retrieval Mission (Orion-ARM), variant of the Asteroid Retrieval Mission using Orion