L'Atlantide (1921) is a French silent film directed by Jacques Feyder, and the first of several adaptations of the best-selling novel L'Atlantide by Pierre Benoit.

L'Atlantide may refer to:

• L'Atlantide, a novel by Pierre Benoit, published in 1919.

In film:

• L'Atlantide (1921 film), a 1921 film directed by Jacques Feyder
• L'Atlantide (1932 film), a 1932 film directed by G. W. Pabst
• L'Atlantide (1961 film), a 1961 film directed by Giuseppe Masini and Edgar G. Ulmer
• L'Atlantide (1992 film), a 1992 film directed by Bob Swaim.

And also:

• L'Atlantide is the French name for the legendary island of Atlantis.

L' Atlantide (Lost in Atlantis) is a 1921 French silent fantasy film epic directed by Jacques Feyder based on novel by Pierre Benoît . The film was considered a success in the United States.

Director Frank Borzage began the picture, but ill health forced him to leave (he died the next year). He was replaced by Edgar G. Ulmer.