Yūko Tsushima (津島 佑子 Tsushima Yūko, born March 30, 1947) is the pen name of Satoko Tsushima, a contemporary Japanese fiction writer, essayist and critic. She is also the daughter of famed novelist Osamu Dazai, who died when she was only one year old. While attending Shirayuri Women's University she started publishing fiction. At the age of 24, she published her first collection of stories, Carnival (Shaniku-sai). Now a prolific writer, she is the winner of several literary prizes.