Marcus may refer to:
People
- Carol Marcus, one of the creation team for the Genesis Project, and a past love of James Kirk.
- David Marcus, son of Carol Marcus and James Kirk.
- Claudius Marcus, a Roman of planet 892-IV.
- Admiral Marcus Holt, commander of Deep Space 3.
Planets
- Marcus II, Sten's homeworld.
- Marcos XII, the first planet which the evil angel-being Gorgan decided to conquer.
Actors
- Trula M. Marcus, an actress in one Deep Space Nine episode, Shadowplay.
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