Marcus could refer to:
- Last name
- Carol Marcus, a leading 23rd century molecular biologist
- Claudius Marcus, a Magna Roman politician and leader
- David Marcus, a leading scientist for Project Genesis
- Gwendolyn Marcus
- Radly Marcus, a Starfleet officer who visited Heartland
- Marcus (Starfleet)
- Marcus (security)
- Marcus (Maquis)
- Middle name
- John Marcus Torres, the father of Starfleet officer B'Elanna Torres
- First name
- Marcus Aurelius, a 2nd century Roman emperor
- Marcus Bertrand, CO of the USS Potemkin who was assimilated by the Borg
- Marcus Eiger
- Marcus Holt, CO of Deep Space 3
- Marcus McHenry, flight controller of the USS Excalibur-A
- Marcus Walter Nichols, transparent aluminum inventor and member of DY-100 development team
- Marcus Paulk, a casualty of Earth's Vietnam War
- Marcus Refelian, CO of the USS Incursion
- Marcus van Diemen
- Marcus Tiercellus (23rd century), a Romulan chief engineer
- Marcus Tiercellus (24th century), a Romulan chief engineer
- Marcus Tal (23rd century), a Romulan helmsman
- Marcus Tal (24th century), a Romulan helmsman
- Locations
- Marcus (planet), a Vulcan outpost planet
- Marcus system, an Alpha and Beta Quadrant system
- Marcus II, second planet of the system
- See also:
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