The novel was adapted by Marguerite Roberts for the screenplay of the 1969 film True Grit, directed by Henry Hathaway and starring John Wayne as Rooster Cogburn. He won the Academy Award for Best Actor in 1970.
A film sequel, Rooster Cogburn, was produced from an original screenplay in 1975, with John Wayne reprising his role, and Katharine Hepburn as an elderly spinster, Eula Goodnight, who teams with him.
A made-for-television sequel aired in 1978 entitled True Grit: A Further Adventure and starring Warren Oates and Lisa Pelikan. The TV-movie featured more adventures of Rooster Cogburn and Mattie Ross.
In 2010, Joel and Ethan Coen released another film adaptation of the novel, also entitled True Grit, with thirteen-year-old actress Hailee Steinfeld as Mattie Ross, veteran actor Jeff Bridges playing Rooster Cogburn, Matt Damon as LaBoeuf, and Josh Brolin as Tom Chaney. Their version is claimed to follow the novel more closely than the 1969 film, focusing more on Mattie's point of view, but some scenes from the book were changed for their film version. The Coen movie is shot in settings more typical of the novel. (The 1969 film was shot in the Colorado Rockies and the Sierra Nevada, while the 2010 film was shot in Santa Fe, New Mexico as well as Granger and Austin, Texas.)