There have been several films that have had the title The Man in the Iron Mask, or that have been based on the final section of the novel The Vicomte de Bragelonne by Alexandre Dumas, père, which was itself based on the 18th century legend of the Man in the Iron Mask. The plot often involves D'Artagnan and the Three Musketeers and an identical twin brother of King Louis XIV of France, and it is considered a sequel to The Three Musketeers.
La maschera di ferro (1909), an Italian silent film
The Man in the Iron Mask (1923 film), a German silent film directed by Max Glass
The Iron Mask (1929), an American silent film starring Douglas Fairbanks
The Man in the Iron Mask (1939 film), an American black-and-white film directed by James Whale, starring Louis Hayward, Joan Bennett, Warren William and Alan Hale (as Porthos)
Lady in the Iron Mask (1952), an American color film starring Louis Hayward, Patricia Medina and Alan Hale, Jr. (as Porthos)
Le Masque de fer (1962), an Italian/French film, starring Jean Marais
The Man in the Iron Mask (1977 film), a British TV movie with Richard Chamberlain, Patrick McGoohan, Louis Jourdan, Jenny Agutter, Ian Holm, Ralph Richardson and Vivien Merchant
The Fifth Musketeer also known as Behind the Iron Mask (1979), an Austrian/West German film directed by Ken Annakin, with Ursula Andress, Beau Bridges, Cornel Wilde, Lloyd Bridges, José Ferrer, Olivia de Havilland, Rex Harrison and Alan Hale Jr. (as Porthos); remake of the 1939 film
The Man in the Iron Mask (1985), an Australian animated TV film
The Man in the Iron Mask (1998 film), a British/American film directed by Randall Wallace, with Leonardo DiCaprio, Jeremy Irons, John Malkovich, Gérard Depardieu and Gabriel Byrne
The Man in the Iron Mask (1998), also known as The Mask of Dumas, an American film directed by William Richert, with Edward Albert, Dana Barron, Rex Ryon and Timothy Bottoms