Behind the Mask (also known as The Pack) is a 1958 British drama film directed by Brian Desmond Hurst and starring Michael Redgrave, Ian Bannen and Lionel Jeffries.

The Monthly Film Bulletin wrote: "The first thirty minutes ... outline the character of the hospital staff and the three doctors with economy and force.

Sir Arthur, standing for tradition and intended to engage our sympathy, is shown as reactionary and incompetent; the ambitious Isherwood, of whose unprincipled determination to win we are clearly meant to disapprove, is depicted as anxious to develop research and a good surgeon.

By refusing to face honestly the moral issues raised, this earnest and sincere tribute to hospital surgeons fails to make its point, much less to explore the deeper questions of power corruption at which it hints.

Director Brian Desmond Hurst seems unable to choose between realism and melodrama, leaving his actors unsure how to pitch their performances.