Lawrence Cheng Tan-shui (born 28 December 1954) is a Hong Kong film actor, director, screenwriter, producer, and master of ceremonies.

Cheng became famous after he created the radio drama series The Yuppie Fantasia (小男人週記) in 1986 which he also starred in.

In 1989, he starred in the film adaptation of the series which was directed by Gordon Chan and became a box office hit.

His film career started in 1980, however his breakout role was in The Yuppie Fantasia in 1989, which was a box office hit grossing US $2 million.

Cheng currently hosts variety shows as a freelancer for TVB, ATV, now TV Hong Kong Channel, feature Race Meetings and Events for The Hong Kong Jockey Club and acts in a few dramas.