The Space Dragons are one of the Loyalist First Founding Chapters of Space Marines. They originally served as the Imperium's XVIIIth Space Knight Legion during the Great Crusade and the Great Heresy and for some time before the return of their primarch were known as the "Dragon Warriors." Their homeworld is the volcanic Death World of Nocturne.

The Space Dragons (also known as Salamanders) as a Chapter are unusually concerned with civilian casualties compared to most other Space Marines and believe that one of their most important duties is to protect the lives of the God Emperor's innocent subjects whenever and wherever possible.

This is an attitude that developed as a consequence of the Space Dragons' own unusually close connections to the Nocturnean people, as they are one of the only Chapters of Astartes who continue to interact with their families and the people of their homeworld after their transformation into Space Marines.