Yukiko Tamaki is a Japanese voice actress born on February 10, 1980, in Chiba Prefecture, Japan. She began her career in the 1990s and was originally known by the name Yukiko Tamaki before changing her professional name to Yuuki Tamaki in April 2008. She was once affiliated with the agency Toritori Office until March 2009, after which she pursued a career as a freelancer.

Tamaki is known for her lively voice and versatility, frequently voicing energetic young boy characters. Her career spans numerous anime television series, films, and video games. Among her notable roles is Coby Hansen in the Japanese version of Transformers: Cybertron, known in Japan as Transformers: Galaxy Force. She also voiced the character Build Boy, who merges to form Build King, in the series Transformers: Robots in Disguise, known in Japan as Transformers: Car Robots. Another of her roles is Butch in the anime Demashitaa! Powerpuff Girls Z. She played the part of May in the series Coyote Ragtime Show.

Her other significant anime credits include Hirokazu Shiota in Digimon Tamers and its associated film, Pokkle in the 1999 Hunter x Hunter series, Kenta Iizuka and other roles in the Ojamajo Doremi franchise, and Sieg or Zeke in Beet the Vandel Buster. She has also taken on roles in series such as Eyeshield 21, Speed Grapher, Super GALS, and Hell Girl. In addition to television work, she voiced the character Asa in the film Tekkonkinkreet. Her talents also extend to video games and visual novels, where she has voiced characters such as Wolfgang Schreiber in Dies irae.