Marcus (disambiguation)

Characters:
 * Marcus - the elderly super mutant sheriff of Broken Hills in Fallout 2 and of Jacobstown in Fallout: New Vegas
 * Marcus (Broken Steel) - a mentioned-only Knight of the Brotherhood of Steel in Fallout 3
 * Marcus Christensen - a mentioned-only soldier in Fallout: New Vegas
 * Marcus Brody - the VP of technology for the Sunset Sarsaparilla Company

Real life people:
 * Marcus Barber - a QA analyst on the Fallout: Brotherhood of Steel development team.