Naoko Matsui (松井 菜桜子, Matsui Naoko) is a Japanese voice actress and narrator from Hakodate, Hokkaido. Matsui was a member of Production Baobab for 20 years before becoming a freelancer. She is also a voice acting instructor. Matsui is most notable for the roles of Uru Chie in High School! Kimengumi, Rem Ayanokōji in Dream Hunter Rem, Katsumi Liqueur in Silent Möbius, Chiyoko Wato in The Three-Eyed One, Runrun in Mahōjin Guru Guru, Rabby in Gall Force Eternal Story, Roux Louka in Mobile Suit Gundam ZZ, Dorothy Catalonia in Mobile Suit Gundam Wing, Azusa Shiratori in Ranma ½, Miyako Todaiji in Kamikaze Kaito Jeanne, and Sonoko Suzuki in Detective Conan. Matsui lives in Tokyo. She was once married to fellow voice actor Kenyu Horiuchi but they divorced. Besides voice acting, Matsui is also a theatre actress and co-leader of a theatre group. At a younger age, she wanted to become a musical theatre actress.