Barnard's Loop (catalogue designation Sh 2-276) is an emission nebula in the constellation of Orion.

The loop takes the form of a large arc centered approximately on the Orion Nebula.

The stars within the Orion Nebula are believed to be responsible for ionizing the loop.

[1][2] It is thought to have originated in a supernova explosion about 2 million years ago, which may have also created several known runaway stars, including AE Aurigae, Mu Columbae and 53 Arietis, which are believed to have been part of a multiple star system in which one component exploded as a supernova.

[3] Although this faint nebula was certainly observed by earlier astronomers, it is named after the pioneering astrophotographer E. E. Barnard who photographed it and published a description in 1894.