Marie Effie Wilton, Lady Bancroft (1836–1921) was an English actress and theatre manager. She appeared onstage as Marie Wilton until after her marriage in December 1867 to Squire Bancroft, when she adopted his last name. Bancroft and her husband were important in the development of Victorian era theatre through their presentation of innovative plays at the London theatres that they managed, first the Prince of Wales's Theatre and later the Haymarket Theatre.