Night and Fog (Chinese: 天水圍的夜與霧) is a 2009 Hong Kong film directed by Ann Hui. Based on a real murder-suicide case in Tin Shui Wai in 2004, the film attempts to raise awareness of some issues related to new immigrants in Hong Kong. The film stars Simon Yam as Lee Sum, the abusive husband, and Zhang Jingchu as Wong Hiu-ling, his wife. It is the second and final volume of Ann Hui's Tin Shui Wai series, the first one being The Way We Are.

The film was premiered at the 2009 Hong Kong International Film Festival on 22 March (along with Shinjuku Incident) and 31 March. It was on wide release in Hong Kong from 14 May 2009.