Ann Hui On-wah, (Chinese: 許鞍華; born 23 May 1947) is a film director, producer, screenwriter and actress from Hong Kong who is one of the most critically acclaimed filmmakers of the Hong Kong New Wave. She is known for her films about social issues in Hong Kong which include: literary adaptations, martial arts, semi-autobiographical works, women's issues, social phenomena, political changes, and thrillers. She served as the president of the Hong Kong Film Directors' Guild from 2004 to 2006.Hui has won numerous awards. She won Best Director at the Golden Horse Awards three times (1999, 2011, 2014); Best Film at the Asia Pacific Film Festival; and Best Director at the Hong Kong Film Awards six times (1983, 1996, 2009, 2012, 2015, 2018).

Only two films have won a Grand Slam (Best Picture, Best Director, Best Screenplay, Best Actor, and Best Actress) at the Hong Kong Film Awards; they are Summer Snow and A Simple Life, both directed by Ann Hui. She was honored for her lifetime accomplishments at the 2012 Asian Film Awards. In 2017, the US based Academy of Motion Picture Arts and Sciences invited Hui to become a member.