Margaret Denise Quigley (born May 22, 1979), professionally known as Maggie Q, is an American actress, activist, and model.

She began her professional career in Hong Kong, with starring roles in the action films Gen-Y Cops (2000) and Naked Weapon (2002), before appearing in the American productions Mission: Impossible III (2006), Live Free or Die Hard (2007), Priest (2011) and The Protégé (2021). She portrayed Tori Wu in the dystopian science-fiction action film Divergent (2014), and reprised her role in the sequels, Insurgent (2015) and Allegiant (2016).

Q starred in the title role on The CW action-thriller series Nikita (2010–2013), and also had a main role as FBI Special Agent Hannah Wells in the political thriller series Designated Survivor (2016–19). She provided the voice of Wonder Woman on the animated series Young Justice (2012–19).