Hirari Mizui (水井 ひらり, Mizui Hirari, born 22 July 2000) is a Japanese badminton player. She graduated from Futaba Mirai School. She was the girls' singles bronze medalist at the 2017 Asian Junior Championships. Mizui participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina. She won the bronze medal in the mixed badminton team event.