Yumiko Nakajima is a Japanese voice actress and singer from Chiba Prefecture, born on August 31st. She is affiliated with the talent agency B-Box. Her career in the anime industry began in 2002 with a role in the television anime series Spiral: Suiri no Kizuna.

Nakajima is widely recognized for her portrayal of Yuko Amamiya in the ef series, a role that brought her significant attention. She voiced the character in the 2007 anime adaptation ef: a tale of memories, its 2008 sequel ef: a tale of melodies, and the original visual novels from the game developer minori. In addition to her voice work for the ef anime, she also performed theme songs for the series.

Beyond the ef franchise, her career is marked by a strong and recurring collaboration with the game studio minori. She voiced lead roles in numerous minori titles under the alias Yuna Yamada, a name used for her work in adult-rated games. Some of these notable roles include Erika in eden* and Hotaru Amano in Supipara. Her work with minori also extended to hosting an internet radio show related to the ef games.

Nakajima's filmography includes a variety of other roles in anime and games. Early in her career, she appeared in productions such as the OVA Papillon Rose and the 2004 theatrical film Naruto the Movie: Snow Princess' Book of Ninja Arts. Her television anime credits also include parts in The Law of Ueki and the drama CD and internet radio series 090 Eko to Issho. She has worked with directors and fellow voice actors on multiple projects, including frequent collaborations with actor Takagi Motoki, director Oonuma Shin, and voice actors Shimono Hiro and Taguchi Hiroko.