Louis Fan Siu-wong (born 19 June 1973) is a Hong Kong actor and martial artist.

After completing his studies, Fan returned to the Hong Kong film industry, and starred in Stanley Tong's Stone Age Warriors (1991).

He claims that the director and producers of the film met him at the Hong Kong Airport upon arrival and immediately offered him the role.

He left TVB in the 2000s, and appeared in several Taiwanese and mainland Chinese television series before focusing on films.

Fan's performance in Ip Man earned him a nomination for Best Supporting Actor at the 28th Hong Kong Film Awards in 2009.