The Dreadwing was the name given to one of the six specialised "wing" formations of the Dark Angels Space Marine Legion that existed during the Great Crusade and Horus Heresy. These formations were known collectively as the Hexagrammaton and existed outside the regular chain-of-command and organisation of the Ist Legion. Each was led by an officer elected to the position known as a "voted-lieutenant." The Dreadwing was disbanded at some point after the end of the Horus Heresy.

The Dreadwing was specialised in the use of tactics to defeat the worse foes faced by the Ist Legion on the battlefield and was deployed when there seemed to be no other way to destroy an enemy. The Dreadwing was the only formation of the Dark Angels Legion known to employ the infamous Legion Destroyer Squads.

The Dreadwing formation as a whole was led by a voted-lieutenant known within his Legion by the title of "Dreadbringer."