Marco

 appears several times in the Doctor Who universe and the relevant real world. Instances are listed below in alphabetical order by surname. If no surname is available, alphabetization occurs by the disambiguation term — that is, the bit between the parentheses in a title like Waitress (Vincent and the Doctor).

In-universe

 * Marco (The Masque of Mandragora) (TV: The Masque of Mandragora)
 * Marco Polo (TV: Marco Polo)
 * Marco (The Time of Angels) (TV: The Time of Angels / Flesh and Stone)

Directors

 * Marco Ciglia, who was 1st assistant director for TV: Meat

Stories

 * Marco Polo (TV story), a season 1 serial of Doctor Who