Hiroko Kanasugi (金杉 弘子, Kanasugi Hiroko) is a Japanese screenwriter from Tokyo, Japan. She is a member of the Japan Screenwriters Federation.

She was originally a writer for variety shows and radio programs. She made her debut as a screenwriter in 2001 with the TV drama Yappari neko ga suki (I Like Cats). She is a multi-talented writer who is active in a wide range of fields, including screenplays for movies, anime and TV dramas, as well as radio, children's television programs and lyrics. She was the exclusive scriptwriter for the anime Jewelpet series.