A Night of Knowing Nothing is a documentary film, directed by Payal Kapadia and released in 2021. An exploration of university student life in India, the film centres on letters written by L., a student at the Film and Television Institute of India, to her estranged boyfriend after they are separated when he is forced to quit film school and denied permission from his family to continue dating L. because she is not of the same caste.

The film premiered in the Directors' Fortnight stream at the 2021 Cannes Film Festival, where it was named the winner of the L'Œil d'or award for Best Documentary Film. It was subsequently screened at the 2021 Toronto International Film Festival, where it was one of the winners of the Amplify Voices Award.

The film has been acquired for commercial distribution by Square Eyes.