The Man in the Iron Mask is a 1998 American action drama film written, directed, and produced by Randall Wallace in his directorial debut. It stars Leonardo DiCaprio in a dual role as the title character and the villain, Jeremy Irons as Aramis, John Malkovich as Athos, Gérard Depardieu as Porthos, and Gabriel Byrne as D'Artagnan. Some characters are from Alexandre Dumas's D'Artagnan Romances and some plot elements are very loosely adapted from his 1847-1850 novel The Vicomte de Bragelonne. This was Leonardo DiCaprio's first film following the success of Titanic (1997).

The film centers on the aging four musketeers, Athos, Porthos, Aramis, and D'Artagnan, during the reign of King Louis XIV. It explores the mystery of the Man in the Iron Mask, with a plot closer to the flamboyant 1929 version starring Douglas Fairbanks, The Iron Mask, and the 1939 version, directed by James Whale, than to the original Dumas book. The film received mixed reviews but was a financial success, grossing $183 million worldwide against a budget of $35 million.