Momoko Ishii (石井桃子, March 10, 1907 – April 2, 2008) was a distinguished Japanese author and translator of children's books. Ishii was born in Urawa, Saitama, and graduated from the Japan Women's University with an English literature degree. While working as an editor at Iwanami Shoten Publishers, she decided to become a children's writer after reading Winnie-the-Pooh by English author A. A. Milne, which she translated in 1940. Her first book as an author, Non-chan kumo ni noru (Non-chan rides on a cloud) was published in 1947; a best-seller, it was made into a movie in 1955. All told, she published nineteen books of her own and 120 translations for children.