Alexander Law Kai-Yui (; 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, matriculation 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).
| 2010 | Echoes of the Rainbow (2009) | Won: Best Screenplay | 29th Hong Kong Film Awards |
| Won: Best Original Film Song | |||
| 1988 | An Autumn's Tale (1987) | Won: Best Screenplay | 7th Hong Kong Film Awards |
| 1988 | Painted Faces (1988) | Won: Best Director | 25th Golden Horse Film Festival and Awards |
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