Ayaka Nishiwaki
- Born
- 15 February 1989 (37 years)
- Place of birth
- Hiroshima, Hiroshima, Japan
- Gender
- Female
Ayaka Nishiwaki (西脇 綾香, Nishiwaki Ayaka), nicknamed A~chan (あ～ちゃん, stylized as a-chan), is a Japanese singer and dancer. She is known as one of the members of the Japanese electropop group Perfume.
