Mary Merrall (5 January 1890 – 31 August 1973), born Elsie Lloyd,[1][2] was an English actress whose career of over 60 years encompassed stage, film and television work.

[4] Among her most famous stage roles were Lady Macbeth in a controversial but influential 1928 modern-dress production by Barry Jackson which opened in Birmingham before transferring to London's Royal Court Theatre, and Mrs. Danvers in Daphne du Maurier's Rebecca at the Strand Theatre in 1940.

Her stage career also took her to the United States, where she appeared in Canaries Sometimes Sing (Frederick Lonsdale) in New York and Chicago in 1930.

As film work began to dry up from the late 1950s, Merrall increasingly found work in television, appearing in several productions for the ITV drama strands Play of the Week and ITV Playhouse as well as guest appearances in popular series such as Sir Francis Drake, Dixon of Dock Green, The Saint, The Avengers, Randall and Hopkirk (Deceased) and the UFO episode "A Question of Priorities".

Her first marriage to John Bouch Hissey in 1909[6][7] ended acrimoniously in 1914 amid a great deal of public and media interest, after Hissey brought a highly publicised divorce suit alleging infidelity on Merrall's part, naming several men including famous music hall star Albert Whelan.