Mary McCoy, professionally known as Maimie McCoy (born April 21, 1979) is an English actress. She portrayed Milady de Winter in The Musketeers (2014–2016), and is the female lead in the ITV reboot series Van der Valk (2020–).

Mary McCoy was born in Yorkshire. McCoy is the daughter of restaurateurs Eugene and Barbara McCoy, once managers of Tontine restaurant near Stokesley, who now run the Crathorne Arms pub in Crathorne, North Yorkshire. Her elder brother Rory is the owner of London restaurants Ducksoup and The Picklery Little Duck, and her younger brother is actor, singer, and dancer Eugene McCoy. Her maternal uncle is the impressionist Kevin Connelly.