Libel is a 1959 British drama film which stars Olivia de Havilland, Dirk Bogarde, Paul Massie, Wilfrid Hyde-White and Robert Morley. The film's screenplay was written by Anatole de Grunwald and Karl Tunberg from a play of the same name by Edward Wooll, and it was directed by Anthony Asquith.

While traveling in London, Jeffrey Buckingham (Massie), a Canadian WWII veteran, sees Sir Mark Sebastian Loddon (Bogarde) on television leading a tour of his grand family home. Buckingham was held in a German POW camp with Loddon, and while watching him, becomes convinced that he is in fact another former POW, Frank Welney, an actor (also played by Bogarde). Buckingham publicly announces his suspicion that Welney murdered Loddon during an escape from the POW camp, and has taken the young nobleman's place. Loddon sues Buckingham for libel, but his mind is still battered by some terrible incident that occurred during his escape fifteen years before, and in time even his loyal wife (deHavilland) begins to doubt him.

A California commercial pilot sees a telecast in London of an interviews with Sir Mark Lodden at his home. The Canadian is convinced that the baronet is a fraud, that he is actually a look-alike actor named Frank Welney. The Canadian, the baronet, and the actor were all prisoners in the same German camp during the war and escaped together. One of them disappeared during the escape. Was he Sir Mark or Welney? The tabloids have a field day with the Canadian's accusations and Lady Maggie urges her husband to sue for libel and engage the distinguished barrister Sir Wilfred. The long-drawn-out case is made complex by the fact that Sir Mark himself is not quite sure of his identity. Injured in the war, he stutters on occasion and has difficulty remembering portions of his life. As the evidence sways back and forth in court, it begins to appear that Sir Mark is an impostor and the possible murderer of the missing baronet. Even his wife is convinced of his guilt and turns against him. She denounces him as a stranger who stole her love. Written by alfiehitchie