Yui Hatano (Japanese: 波多野 結衣/はたの ゆい, Hepburn: Hatano Yui, born May 24, 1988) is a Japanese AV idol, model, actress and idol singer. Boasting one of the longest and most prolific careers in Japanese pornography, Hatano made appearances in over 2000 adult films so far, thus making her one of the most popular and recognizable faces in AV. Her popularity crossed over into mainstream entertainment (with appearances in theatrical films) and international territories as well, earning her the nickname "Sekai no Hatano" ("The World's Hatano"). As of 2019 she's currently represented by the AV agency T-Powers, she is also a member of the idol group T♡Project.
Born on May 24, 1988 in Tokyo but raised in Kyoto, Hatano made her debut in the adult industry in 2008, when she first appeared in Amateur Or More ZERO, Less Than Actress 07 on July 3, 2008, under the Zero label of the AV company Prestige which specialized in finding and introducing amateur girls into the industry. Prior to performing in adult films, she had graduated from a cosmetology school, and had initially thought of becoming a gravure idol. However the competitive and low-paying world of gravure forced her to look for a more lucrative career which happened to be performing in adult films.