Marco may refer to:
- KAOS agent who operates the Knight Stamp Redemption Center as a front for a munitions depot [Portrayed by John Harding, Episode #102: "The Day They Raided the Knights"].
- CONTROL agent who is also a musician. Marco is unavailable for assignment to rescue Professor Pheasant because, along with Agents Holloway and Curtis, he is in Las Vegas for a gig. [Mentioned, Episode #113: "Pheasant Under Glass".]
- Diminutive informer who reveals to Maxwell Smart that KAOS has been acquired by IH Industries and its fiendish owner Ironhand [Portrayed by Billy Barty, Episode #114: "Ironhand"].