Marion Bailey is an English actress. She is best known for her work with her partner, filmmaker Mike Leigh, including the films Meantime (1983), All or Nothing (2002), Vera Drake (2004), Mr. Turner (2014), for which she was nominated Supporting Actress of the Year by the London Film Critics' Circle, and Peterloo (2018). In 2019 and 2020, she portrayed Queen Elizabeth The Queen Mother in the third and fourth seasons of The Crown on Netflix, for which she won a Screen Actors Guild award winner for best ensemble in 2020 and 2021.

All or Nothing is a 2002 British drama film written and directed by Mike Leigh and starring Timothy Spall and Lesley Manville. Like much of Leigh's work, the film is set in present-day London, and depicts three working-class families and their everyday lives.