Aki Toyosaki (豊崎 愛生, Toyosaki Aki?, born October 28, 1986) is a Japanese voice actress and singer from Tokushima Prefecture, Japan. She had her first major voice acting roles in 2007, voicing Amuro Ninagawa in Kenkō Zenrakei Suieibu Umishō and Su in Shugo Chara!. She was later named as a "Best New Actress" at the 4th Seiyu Awards in 2010 for her role as Yui Hirasawa in K-On! and Kana Nakamachi in Kanamemo.
Her career as a musician began with her performance of the opening and ending themes of the anime series K-On! in April 2009. In the same month, she and three other voice actresses debuted as the musical group Sphere with their single "Future Stream". Later, K-On!'s ending theme was given Animation Kobe's "Best Song" award. She released her first solo single "love your life" in October 2009. She was awarded "Best Musical Performance" at the 4th Seiyu Awards for her performance on the K-On! mini-album Hōkago Tea Time with four other actresses.