Marcus may refer to: People * Marcus, a security officer serving aboard the USS Enterprise-D * Alexander Marcus, father of Carol Marcus * Admiral Alexander Marcus, his alternate reality counterpart * Carol Marcus, one of the creation team for the Genesis Project and a past love of James Kirk * Carol Marcus, her alternate reality counterpart * David Marcus, son of Carol Marcus and James Kirk * Claudius Marcus, a Roman of planet 892-IV * Claudius Marcus (gladiator), a gladiator from 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 * Marcus (stand-in), a stand-in on VOY: "Random Thoughts" * Trula M