Mr. Arkadin (also released as Confidential Report) is a 1955 thriller film noir written, produced and directed by Orson Welles. It stars Welles, Robert Arden, Paola Mori, Michael Redgrave, Patricia Medina, Akim Tamiroff, Peter van Eyck, and Katina Paxinou. The film centers on an American smuggler (Arden) who is hired by a wealthy amnesiac, the titular Arkadin (Welles), to investigate his mysterious past.

The screenplay was based on scripts Welles had originally co-authored for his radio drama series The Adventures of Harry Lime. A co-production of France, Spain, and Switzerland, it was shot in several locations throughout Western Europe.

Like many of Welles' films, Mr. Arkadin had a difficult production and was released in several different versions. Critic Jonathan Rosenbaum identified at least seven different versions of the story. The film has been praised by directors like Christopher Nolan and Shinji Aoyama.