Diane is a 2018 American drama film written and directed by Kent Jones in his narrative directorial debut. It stars Mary Kay Place in the title role, with Jake Lacy, Deirdre O'Connell, Andrea Martin, and Estelle Parsons in supporting roles. It revolves around a selfless woman whose unwavering service to others hides a lifelong secret.

The film had its world premiere at the 17th Tribeca Film Festival on April 22, 2018, where it won three prizes, including the Founders Award for Best U.S. Narrative Feature. It was released in select theaters and on VOD on March 29, 2019, by IFC Films. It received generally positive reviews from critics, who praised Place's performance and Jones' direction and screenplay. At the 35th Independent Spirit Awards, the film earned two nominations: Best First Feature and Best Female Lead (for Place).