Yōko Ogawa (小川 洋子, Ogawa Yōko, born March 30, 1962) is a Japanese writer. Her work has won every major Japanese literary award, including the Akutagawa Prize and the Yomiuri Prize. Internationally, she has been the recipient of the Shirley Jackson Award and the American Book Award. The Memory Police was also shortlisted for the International Booker Prize in 2020.

Some of her most well-known works include The Housekeeper and the Professor, The Diving Pool, and Hotel Iris. Yōko Ogawa was born in Okayama, Okayama Prefecture, graduated from Waseda University, and lives in Ashiya. Since 1988, she has published more than twenty works of fiction and nonfiction. Her novel The Professor and his Beloved Equation has been made into a movie.

In 2006, she co-authored An Introduction to the World's Most Elegant Mathematics with Masahiko Fujiwara, a mathematician, as a dialogue on the extraordinary beauty of numbers. A film in French, L'Annulaire (The Ringfinger), directed by Diane Bertrand and starring Olga Kurylenko and Marc Barbé, was released in France in June 2005 and subsequently made the rounds of the international film festivals; the film, some of which is filmed in the Hamburg docks, is based in part on Ogawa's work.