Marcus may refer to:
- Marcus, a security officer serving aboard the USS Enterprise-D
- Alexander Marcus, father of Carol Marcus
- Alexander Marcus (alternate reality), his alternate reality counterpart
- Carol Marcus, one of the creation team for the Genesis Project and a past love of James Kirk
- Carol Marcus (alternate reality), her alternate reality counterpart
- Claudius Marcus (gladiator), a gladiator from 892-IV
- Claudius Marcus (Proconsul), a Roman of planet 892-IV
- David Marcus, son of Carol Marcus and James Kirk
- Marcus Holt, commander of Deep Space 3
- Marcus II, Sten's homeworld
- Marcos XII, the first planet which the evil angel-being Gorgan decided to conquer
- Marcus (stand-in), a stand-in on VOY: "Random Thoughts"
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