How Green Was My Valley is a 1941 drama film directed by John Ford. The film was produced by Darryl F. Zanuck, written by Philip Dunne, and based on the Richard Llewellyn novel of the same name. The film stars Walter Pidgeon, Maureen O'Hara, Anna Lee, Donald Crisp, and Roddy McDowall. It was nominated for ten Academy Awards, winning five and beating out such classics as Citizen Kane, The Maltese Falcon, Suspicion and Sergeant York for Best Picture.

The film tells the story of the Morgans, a close, hard-working Welsh family at the turn of the twentieth century in the South Wales coalfield at the heart of the South Wales Valleys. It chronicles a socio-economic way of life passing and the family unit disintegrating.

In 1990, How Green Was My Valley was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".