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

Herman Jacob Mankiewicz was an American screenwriter who, with Orson Welles, wrote the screenplay for Citizen Kane (1941). Both Mankiewicz and Welles would go on to receive the Academy Award for Best Original Screenplay for the film. He was previously a Berlin correspondent for Women’s Wear Daily, assistant theater editor at The New York Times, and the first regular drama critic at The New Yorker. Alexander Woollcott said that Mankiewicz was the "funniest man in New York".