Western Veil Nebula is a cloud of heated and ionized gas and dust in the constellation Cygnus.

This is a portion of the Veil Nebula which is the visible portion of the Cygnus Loop, a supernova remnant, many portions of which have acquired their own individual names and catalogue identifiers. The source supernova was a star 20 times more massive than the Sun which exploded between 10,000 and 20,000 years ago.

While previous distance estimates have ranged from 1200 to 5800 light-years, a recent determination of 2400 light-years is based on direct astrometric measurements. (The distance estimates affect also the estimates of size and age.)

The analysis of Hubble Space Telescope images revealed the emissions from the nebula indicates the presence of oxygen, sulfur, and hydrogen.