Alex Law Kai-Yui (Chinese: 羅啟銳; 19 August 1952 – 2 July 2022) was a Hong Kong film director, screenwriter, and producer.

Alex Law
Law at the 2015 Toronto International Film Festival
Born	羅啟銳 Law Kai-Yui (1952-08-19)19 August 1952 British Hong Kong
Died	2 July 2022(2022-07-02) (aged 69) Hong Kong
Alma mater	University of Hong Kong (B.A. in Chinese, English and Comparative Literature) New York University
Awards	Hong Kong Film Awards – Best Screenplay 1988 An Autumn's Tale 2010 Echoes of the Rainbow Best Original Film Song 2010 Echoes of the Rainbow Golden Horse Awards – Best Original Screenplay 1998 City of Glass

Law was educated at the Diocesan Boys' School, Hong Kong, matriculating in 1971. Law collaborated with Mabel Cheung on many of her most famous films, including the "Migration Trilogy": Illegal Immigrant (1985), An Autumn's Tale (1987) and Eight Taels of Gold (1989). He wrote the screenplay for Cheung's The Soong Sisters (1997).