Flag Day is a 2021 American drama film directed by and starring Sean Penn based on Jennifer Vogel's 2004 memoir, Flim-Flam Man: A True Family History.

The daughter of a con artist struggles to come to terms with her father's past, involving the fourth-largest seizure of counterfeit bills in U.S. history, nearly $20 million.

In March 2012, Penn expressed interest in joining the cast of a Flim-Flam Man film adaptation[7] directed by Alejandro González Iñárritu.

[18] In an interview with Deadline Hollywood at the 2021 Cannes Film Festival, Penn said that he initially thought that it would be something he might act in, but after trouble identifying the right director he took on the offer as it was a movie that he would have liked to see get made.

[22] The soundtrack to Flag Day features original music by Eddie Vedder, Glen Hansard and Cat Power.

The website's consensus reads: "Flag Day benefits from powerful performances and a moving fact-based story, but it's largely lost in the movie's melodramatic din.