The name or term "Trajan" may refer to:
- Elianu Trajan — An Ultramarines Chaplain.
- Lucian Trajan — A Space Marine Captain of the Ultramarines.
- Trajan (Admiral) — Admiral of the Imperial Navy.
- Trajan (Captain) — A Captain of the Ultramarines.
See also
- Trajann Valoris — Captain-General of the Adeptus Custodes.