Shin Koyamada is a Japanese actor and producer. He is best known for roles in The Last Samurai and the Disney Channel television movie Wendy Wu: Homecoming Warrior.

The Last Samurai is a 2003 epic period action drama film directed and produced by Edward Zwick, who also co-wrote the screenplay with John Logan and Marshall Herskovitz from a story devised by Logan. The film stars Ken Watanabe and Tom Cruise, who also produced, along with Timothy Spall, Billy Connolly, Tony Goldwyn, Hiroyuki Sanada, and Koyuki in supporting roles.