Taro Iwashiro (岩代 太郎 Iwashiro Tarō, born May 1, 1965 in Tokyo) is a Japanese composer.
Iwashiro has composed the music for many Japanese television series and films. He has composed for both Red Cliff films, Shinobi: Heart Under Blade, Azumi, The Prince of Tennis, Rurouni Kenshin: The Motion Picture, and the Korean film Memories of Murder. He was also lead composer for the Capcom video game Onimusha 2: Samurai's Destiny. Iwashiro has often led the Tokyo Metropolitan Symphony Orchestra for his soundtracks, including the 2005 taiga drama Yoshitsune and 2008 film Red Cliff.