Akiyuki Nosaka (野坂 昭如 Nosaka Akiyuki?, October 10, 1930 – December 9, 2015) was a Japanese novelist, singer, lyricist, and member of the House of Councillors. As a broadcasting writer he used the name Yukio Aki (阿木 由紀夫 Aki Yukio?) and his alias as a chanson singer was Claude Nosaka (クロード 野坂 Kurōdo Nosaka?).
Nosaka was born in Kamakura, Kanagawa, the son of Sukeyuki Nosaka, who was a sub-governor of Niigata. Together with his sisters he grew up as an adopted child of a Harimaya (surname) family in Nada, Kobe, Hyōgo. One of his sisters died as the result of malnutrition, and his adoptive father died during the 1945 bombing of Kobe in World War II. Another sister died of malnutrition in Fukui. Nosaka would later base his short story Grave of the Fireflies on these experiences. He is well known for children's stories about war. His Grave of the Fireflies and American Hijiki won the Naoki Prize in 1967.