Michelle Suzanne Dockery (born 15 December 1981) is an English actress. She is best known for her role as Lady Mary Crawley in the British historical drama television series Downton Abbey (2010–2015), for which she was nominated for a Golden Globe Award and for three consecutive years for the Primetime Emmy Award for Outstanding Lead Actress in a Drama Series. She reprised her role in the films Downton Abbey (2019) and Downton Abbey: A New Era (2022).

After graduating from the Guildhall School of Music and Drama, Dockery made her professional stage debut in the play His Dark Materials in 2004. For her role as Eliza Doolittle in the 2007 London production of Pygmalion, she was nominated for an Evening Standard Award. For her role in the 2009 play Burnt by the Sun, she received a Laurence Olivier Award nomination for Best Actress in a Supporting Role. Dockery appeared in the films Hanna (2011), Anna Karenina (2012), Non-Stop (2014) and The Gentlemen (2019). She also starred in the western miniseries Godless (2017), for which she received her fourth Emmy nomination, and the drama miniseries Defending Jacob (2020) and Anatomy of a Scandal (2022). She attended the Finch Stage School and graduated from the Guildhall School of Music and Drama in 2004.