Kaori Kishitani (岸谷 香, Kishitani Kaori) (born February 17, 1967), formerly Kaori Okui (奥居 香, Okui Kaori), is a Japanese musician and singer-songwriter, best known as the lead vocalist of the all-female rock band Princess Princess and currently the lead vocalist of the band Unlock the Girls. In addition to her career as a musician, she has written songs for several J-pop artists.