Mr. Nobody is a 2009 science fiction drama film written and directed by Jaco Van Dormael and starring Jared Leto, Sarah Polley, Diane Kruger, Linh Dan Pham, Rhys Ifans, Natasha Little, Toby Regbo, and Juno Temple. It tells the life story of Nemo Nobody, a 118-year-old man who is the last mortal on Earth after the human race has achieved quasi-immortality. Nemo, memory fading, tells a doctor and journalist about his three main loves and his parents' divorce and the subsequent hardships he endured. The speculative narrative frequently changes course to investigate the alternate life paths that could have resulted from his making different decisions in his life, focusing on when he is nine, fifteen, and thirty-four. The film has a nonlinear narrative that incorporates the multiverse hypothesis.

The world premiere of Mr. Nobody was at the 66th Venice International Film Festival, where it received the Golden Osella and the Biografilm Lancia Award. Critical response to the film was generally positive, and it was nominated for seven Magritte Awards, winning six, including Best Film and Best Director for Van Dormael. The film was a co-production between Belgium, France, Germany and Canada and was released theatrically in Belgium and France on 13 January 2010, in Germany on 8 July 2010, and in Canada on 16 July 2010. The film was a box office flop, selling a total of 441.795 admissions in Europe and grossing $3.5 million worldwide against a production budget of €33 million ($47 million). Since its original release, Mr. Nobody has become a cult film, noted for its philosophy, cinematography, personal characters, and Pierre Van Dormael's soundtrack.