Yumiko Kobayashi (小林 由美子, Kobayashi Yumiko; born June 18, 1979) is a freelance Japanese voice actress from Chiba Prefecture. She was formerly affiliated with Arts Vision until August 2007. She made her voice acting debut as Mita in Kirara while still in college in 1998, and her first lead role was as Kento Yūki in Dennō Bōkenki Webdiver in 2001. She is still good friends with Natsuko Kuwatani, Hisayo Mochizuki, and Nana Mizuki, members of the former voice acting unit Prits; all four voiced characters in Sister Princess.
In an interview in 2019, Kobayashi said that shortly after her debut, while researching how to play a boy who can be dubbed, she came to believe that there was no better way to act than as a child actor, but she was struck by Akiko Yajima's performance as Kevin, the main character in Home Alone, and has since made it her goal. Beginning with the July 6, 2018 episode, she took over the role of Shinnosuke Nohara in Crayon Shin-chan from Yajima, who had played the role since the show began airing on April 13, 1992.
Beast Wars II: Super Life-Form Transformers (1998), Lio Junior
Excel Saga (1999), Excel Kobayashi (Opening Song)
éX-Driver (2000), Sōichi Sugano
Love Hina (2000), Sarah McDougal
A Little Snow Fairy Sugar (2001), Basil
Sister Princess (2001), Mamoru
Duel Masters (2002), Shobu Kirifuda, Katta Kirifuda
Bomberman Jetters (2003), Kobon
D.N.Angel (2003), young Takeshi Saehara
Peacemaker Kurogane (2003), Ichimura Tetsunosuke
The Prince of Tennis (2003), Taichi Dan
Tottoko Hamutarō (2003), Solara
Superior Defender Gundam Force (2004), Genkimaru
Yakitate!! Japan (2004), Kazuma Azuma
Tsubasa Chronicle (2005), young Kurogane
Les Misérables: Shōjo Cosette (2007), Gavroche