AOA (Hangul: 에이오에이; an acronym for Ace of Angels) is a South Korean girl group formed by FNC Entertainment. Originally, AOA debuted as an eight-member girl-band that consisted of Choa, Jimin, Yuna, Youkyung, Chanmi, Hyejeong, Seolhyun, and Mina. AOA is currently promoting as a five-member girl group. Choa left in June 2017, Youkyung in October 2016 (which was followed by termination of her contract and would be a guest member in any future AOA Black activities), and Mina in May 2019. The group officially debuted by having their debut music stage on August 9, 2012, on M Countdown.

On March 11, 2017, AOA held their first Korean solo concert “Ace Of Angels” at Olympic Hall in Seoul.