Margaret

 has several meanings pertinent to the Doctor Who universe and the real world. They are listed below in alphabetical order by surname. If no surname is available, alphabetisation occurs by the disambiguation term — that is, the bit between the parentheses in a title like Waitress (Random Shoes).

As only name

 * Margaret (Artificial Intelligence) (AUDIO: Artificial Intelligence)
 * Margaret (Brave New Town) (AUDIO: Brave New Town)
 * Margaret (Deimos), a tourist on Deimos (AUDIO: Deimos / The Resurrection of Mars)
 * Margaret (Downtime), a Robot Yeti (PROSE: Downtime)
 * Margaret (The Gunpowder Plot) (GAME: The Gunpowder Plot)
 * Margaret (Mad Dogs and Englishmen) (PROSE: Mad Dogs and Englishmen)
 * Margaret (No More Lies), a Vortisaur (AUDIO: No More Lies)
 * Margaret (Phoenix) (PROSE: Phoenix)
 * Margaret (Salvation) (PROSE: Salvation)

As first name

 * Margaret Blaine, the human guise of Blon Fel-Fotch Passameer-Day Slitheen (TV: Aliens of London / World War Three, Boom Town)
 * Margaret Cain (TV: The Waters of Mars)
 * Margaret Havers (PROSE: Eater of Wasps)
 * Margaret Jones (PROSE: Unnatural History)
 * Margaret Pollard (PROSE: Prologue)
 * Margaret Schuman (PROSE: Most Horrid)
 * Margaret Thatcher, Prime Minister of the United Kingdom
 * Margaret Waterfield (PROSE: Prelude Birthright, Birthright)
 * Margaret Webster (COMIC: Do Not Go Gentle Into That Good Night)
 * Margaret Wyndham (HOMEVID: Ghosts of Winterborne)

As name of object, publication or other in-universe item

 * St Margaret's House Museum (AUDIO: The Thirteenth Stone)

Actors

 * Margaret Hickey, who played Mary Smith in TV: The Enemy of the World
 * Margaret John, who played Megan Jones in TV: Fury from the Deep and Grandma Connolly in TV: The Idiot's Lantern

Television

 * Margaret Rushton, who was an assistant floor manager on TV: The Evil of the Daleks