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

She had starring roles in the action films Mission: Impossible III (2006), Live Free or Die Hard (2007), Priest (2011), and Fantasy Island (2020). 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 as the title role on The CW action-thriller series Nikita (2010–13). She also had a main role as FBI Special Agent Hannah Wells in the political thriller series Designated Survivor (2016–19).