Papa (Chinese: 爸爸) is a 2024 Hong Kong family drama film directed and written by Philip Yung. The film is based on the real-life 2010 Heung Wo Street murder, in which a mentally unstable son killed his mother and sister, leaving his father as the sole survivor. Starring Sean Lau, Jo Koo, Dylan So, and Lainey Hung, the film is set in the aftermath of the murder and follows the father (Lau) as he navigates survivor guilt and seeks reconciliation with his son (So).

Philip Yung was initially attached to the film adaptation of the murder case as the screenwriter in 2011 and interviewed the surviving father Kan Fuk-kui while researching the screenplay, before the project was stalled in development. He later purchased the adaptation rights and took on the role of director, with pre-production beginning after Yung finished filming Port of Call (2015). Yung continued to refine the screenplay until 2022 and the project was greenlit in the same year. Principal photography commenced in March 2023, primarily in To Kwa Wan, and shot in a 4:3 aspect ratio.

The film had its world premiere in competition at the 37th Tokyo International Film Festival on 31 October 2024, followed by a theatrical release in Hong Kong on 5 December.