Marion Bailey (born 5 May 1951) 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.