Simon Yam Tat-wah (Chinese: 任達華; born 19 March 1955) is a Hong Kong actor and film producer.

In 1992, Yam gained critical acclaim for his role as the maniacal Judge in the crime film Full Contact, where he faced off in a bloody battle against Chow Yun-fat's character.

In 1993, he starred as "Dhalsim" in the action-comedy film Future Cops, a parody of Street Fighter directed by Wong Jing.

In 1996, Yam began his role as Chiang Tin-Sung, the leader of the Hung Hing triads in the first three instalments of the Young and Dangerous film series.

In 2003, Yam made his Hollywood film debut in Lara Croft: Tomb Raider – The Cradle of Life as Shaolin crime lord.