Keiko Horikawa (born 1969) is a Japanese nonfiction writer. After working as a news reporter and television director at Hiroshima Television Broadcasting, she became a freelance documentary filmmaker and writer. Her work explores subjects including the death penalty and the justice system, war, the atomic bombing of Hiroshima, modern Japanese history, and healthcare. Known for her meticulous research and extensive reporting, Horikawa brings to light the lives of individuals often overlooked in conventional historical narratives. She has received numerous literary and journalism honors, including the Kodansha Nonfiction Award, the Soichi Oya Nonfiction Award, and the Osaragi Jiro Prize, and is widely regarded as one of Japan’s leading contemporary nonfiction writers.