The Sagittarius Arm or Sagittarius-Carina Arm is a dense, major inner spiral arm of the Milky Way galaxy. The arm is located between the Scutum-Crux Arm and the Orion Arm. It is named after its proximity to the Sagittarius constellation, near the Galactic Center.
A number of Messier objects are found in the Sagittarius Arm: M8, M17, M20, M55.