Natsuko Fuji is a Japanese voice actress and actress associated with the theatre company Gekidan Seinenza. She was born on December 16, 1939, in Tokyo, Japan. Her career has spanned both live-action drama and anime voice acting.

Fuji's early career included training and performances in theatre. She joined the theatre company Gekidan Seinenza in April 1963, where she remained active as a member of the acting division. Her work in television dramas and on stage led to numerous opportunities as a voice actress in anime and film dubbing.

One of Fuji's notable early anime roles was as the mother of the character Daikichi in the 1976 series Gowapper 5 Godam. In 1977, she voiced the antagonist Medusa in the mecha anime series Gasshin Sentai Mechander Robo. She also contributed to the Seishun Anime Zenshu series, providing the voice for the character Shigeme. Her other anime voice roles from this period include Fuku Marume in The Ultraman.

Throughout her career, Fuji took on a wide variety of character roles in many notable anime series. Her filmography includes the role of Jinenji's Mother in Inuyasha, a character named Franca in Monster, and an appearance in Turn A Gundam as Anice Bell. She also voiced characters in Ranma ½, Patlabor the Mobile Police, and Nadia: The Secret of Blue Water. In addition to these, she had roles in Case Closed, Gatchaman II, Hell Girl: Fourth Twilight, and the anime adaptations of Trapp Ikka Monogatari (The Story of the Trapp Family) and Pollyanna. Her work also extended to voice acting in dubbed versions of foreign films, such as providing a voice for the Japanese dub of Top Gun.