One Nite in Mongkok (Chinese: 旺角黑夜) is a 2004 Hong Kong crime thriller film written and directed by Derek Yee and starring Daniel Wu, Cecilia Cheung and Alex Fong. The film is a sequel to the Yee-produced 2000 film Double Tap, with Fong reprising his role from the previous installment. A sequel to the film, Triple Tap, was released in 2010, which was once again directed by Yee and featured Fong reprising his role, while also starring Wu in a different role.

The Mainland Chinese release adds an inter-title notice, stating that the film took place in 1996, the final year of British Hong Kong, to promote the idea that vice and immorality characterised earlier eras before the People's Republic of China established sovereignty.