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.

An actor-manager is a leading actor who sets up their own permanent theatrical company and manages the business, sometimes taking over a theatre to perform select plays in which they usually star. It is a method of theatrical production used consistently since the 16th century, particularly common in 19th-century Britain and the United States.