Riiko Tazawa, also known as Tazawa Riiko, is a Japanese voice actress and actress from Tokyo, Japan. Her birthday is July 20th. She is affiliated with the talent agency Atomic Monkey.

Tazawa pursued formal training in the performing arts, having graduated from the Department of Arts, majoring in theater, at Toho Gakuen College of Drama and Music. Her professional skills include swimming and choral singing as a soprano, and she has a personal interest in drawing illustrations.

Her career in voice acting began in the early 2010s with minor roles. One of her first television anime credits was in 2011, voicing a character listed as Boy② in the series Kimi to Boku. The following year, she took on several supporting parts. In 2012, she played the young black goat character Black Kid in the series Arashi no Yoru ni: Himitsu no Tomodachi, and voiced Eiko in Hiiro no Kakera: Tamayori Hime Kitan.

Tazawa is best known for her role as Reika Saionji in the 2012 soccer anime series Ginga e Kickoff!!. In this series, which aired for 39 episodes, she voiced a sixth-grade student and classmate of the main characters who joins the Momoyama Predators soccer team as a defender and libero. She also contributed to the music of the series, performing the song Kawaritai to Omottara Kawarerunda ne! for the show.

Following her work on Ginga e Kickoff!!, Tazawa continued to take on a variety of small roles and cameo appearances. Her later anime credits include a schoolgirl in the Monogatari series episode Hanamonogatari in 2014, a member of the audience in Shigatsu wa Kimi no Uso (Your Lie in April) in 2015, and a student in Watashi ga Motete Dou Sunda in 2016. In addition to her work in anime, she has also voiced characters in video games such as Lord of Vermilion in 2011.