Rika Matsumoto (松本 梨香, Matsumoto Rika, born November 30, 1965) is the Japanese voice actress of Ash Ketchum, or Satoshi in the Japanese version, and many other characters.
Outside of Pokemon, Rica has had roles in series' such as Outlaw Star, Yu-Gi-Oh, and the Super Robot Wars series of games. She's also been a member of the singing group JAM Project, and did work in the Japanese dubs of Super Robot Monkey Team Hyperforce Go! and The Little Mermaid.