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