Sachiko Kojima is a Japanese voice actress and actress born on January 18, 1979, in Chiba Prefecture, Japan. She is affiliated with the talent management firm Mausu Promotion. Kojima began her entertainment career as a child actor, belonging to the theater company Gekidan Nihon Jido. She transitioned to voice acting, initially focusing on dubbing foreign films and providing Japanese voices for actresses such as Christina Ricci, Anna Paquin, and Mena Suvari. Her anime voice work eventually became a more prominent part of her career.

Kojima has built an extensive portfolio of roles across anime series, OVAs, video games, and films. Her career includes a wide range of characters, demonstrating her versatility. She has taken on many roles as energetic young girls. Some of her well-known anime roles include Kozue Matsumoto in the Grappler Baki series, Arusu in Tweeny Witches, and Sayako Kuwahara in Bamboo Blade. She also voiced Susie Q in JoJo's Bizarre Adventure and provided the voice for Orochimaru in a female body in Naruto. In the Precure franchise, she has portrayed characters such as Notrei in Star Twinkle Precure, Kanae Tada in HeartCatch Precure!, and Miyo Masuko in Happiness Charge Precure!.

Kojima has also been active in OVAs and video games. Her game credits include Taki in the Soulcalibur series, Mell Raison in the Sakura Taisen series, and Wraith in Apex Legends. In film, she provided a voice for the acclaimed movie A Silent Voice. Alongside her voice acting colleagues Yuki Masuda and Kyoko Ice, she formed the singing unit Chiffons. In 2008, she married Makoto Yasue, a director at the production company Glovision.