Louis Fan Siu-wong is a Hong Kong actor and martial artist. He is best known worldwide for his starring role as Ricky in Riki-Oh: The Story of Ricky (1991) and as Jin Shanzhao in Ip Man (2008) and Ip Man 2 (2010), as well as roles in numerous television series produced by TVB.

Riki-Oh: The Story of Ricky, also known as Story of Ricky, is a 1991 Hong Kong martial arts splatter film written and directed by Lam Nai-Choi. The film is loosely based on the Japanese manga of the same name by Masahiko Takajo and Tetsuya Saruwatari. Saruwatari also co-wrote the film. The film stars Fan Siu-wong, Fan Mei-sheng, Ho Ka-kui, Gloria Yip, and Yukari Oshima.