Sh2-126 is an emission nebula located in the Lacerta constellation. It is located in the southern part of this constellation, about 1° west of the star 10 Lacertae, a blue variable star (magnitude 4.8 and spectral type O9V) which ionizes the nebula. Invisible to the naked eye due to its magnitude, Sh2-126 has the appearance of a small filament and is mostly visible in astrophotography through Hα (H-alpha) filters. Near this cloud is located the nebula LBN 437. Its brightest part is associated with bright young stars.