Marcus (disambiguation)
Marcus may refer to:

People
 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

Planets
 Marcus II, Sten's homeworld
 Marcos XII, the first planet which the evil angel-being Gorgan decided to conquer

Actors
 Marcus (stand-in), a stand-in on VOY: "Random Thoughts"

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