Aiko Sato (1923–2026) was a Japanese novelist and essayist. The daughter of novelist Kōroku Satō and half-sister of poet Hachirō Satō, she began her literary career in 1950 and went on to become one of Japan's most beloved writers. She won the Naoki Prize for *Tatakai Sunde Hi ga Kurete*, the Women's Literature Prize for *Kōfuku no E*, and the Kikuchi Kan Prize for *Ketsumyaku*. Known for her candid humor and keen observations of family life, aging, and human nature, she wrote both fiction and essays that resonated with generations of readers. Her essay collection *Kyūsai-sai. Nani ga Medetai* (*What Is There to Celebrate at Ninety?*) became a million-selling bestseller and renewed her popularity late in life.