Mank is a 2020 American biographical drama film about screenwriter Herman J. Mankiewicz and his development of the script for Citizen Kane (1941). Directed by David Fincher, based on a screenplay by his late father Jack Fincher, the film is produced by Ceán Chaffin, Douglas Urbanski, and Eric Roth. It stars Gary Oldman in the title role, Amanda Seyfried, Lily Collins, Arliss Howard, Tom Pelphrey, Sam Troughton, Ferdinand Kingsley, Tuppence Middleton, Tom Burke, Joseph Cross, Jamie McShane, Toby Leonard Moore, Monika Gossmann, and Charles Dance.

Fincher's father Jack wrote the script in the 1990s, and David originally intended to film it after he completed The Game (1997), with Kevin Spacey and Jodie Foster as the leads. It never came to fruition, and Jack Fincher died in 2003. Eventually, the project was officially announced in July 2019, and filming took place around Los Angeles from November 2019 to February 2020.

Mank had a limited theatrical release on November 13, 2020, and began streaming on Netflix on December 4, 2020. The film received positive reviews from critics, who praised the direction, cinematography, production values, and musical score, as well as the performances of Oldman and Seyfried.