Nisio Isin (西尾維新 Nishio Ishin), frequently written as NisiOisiN to emphasize that his pen name is a palindrome, is a Japanese novelist and manga writer. He attended and left Ritsumeikan University without graduating. In 2002, he debuted with the novel Kubikiri Cycle, which earned him the 23rd Mephisto Award at twenty years of age. He currently works with Kodansha on Pandora, the Kodansha Box magazine, and Faust, a literary magazine containing the works of other young authors who similarly take influence from light novels and otaku culture. He was also publishing a twelve volume series over twelve months for the Kodansha Box line; Ryusui Seiryoin was matching this output, and the Kodansha Box website stated that this is the first time in the world two authors have done twelve volume monthly novel series simultaneously from the same publisher. In February, 2008, his novel Death Note Another Note: The Los Angeles BB Murder Cases was released in English by Viz Media. Del Rey Manga has already released the first volume in his Zaregoto series. His Bakemonogatari, Nisemonogatari and Katanagatari novels have been adapted into anime series. Nekomonogatari (Kuro) has been adapted into an anime TV movie, and Kizumonogatari will be release in theaters this year. Monogatari Series: Second Season, adapted from 6 books in Monogatari Series will air in July 2013. Another of his works, Medaka Box (manga), has been adapted into a two-season anime series.

NisiOisiN 1981年生まれ。2002年に『クビキリサイクル』で第23回メフィスト賞を受賞し、デビュー — 1981年生，立命館大學肄業。 2002年以《斬首循環-藍色學者與戲言跟班》獲得講談社第二十三回「梅菲斯特獎」並以同作品出道。 2005年之前，除了在出道作為基礎延伸的「戲言系列」之外，另有「世界系列」、「人間系列」等多種嘗試挑戰之作。 2006年出版的「物語系列」在2009年夏天電視動畫化之後，原作因富有獨特韻律節奏的文體與充滿思考趣味的世界觀，備受文壇矚目，在日本年輕讀者間蔚為話題，並被視為日本〇〇年代文學代表性作家之一。其奔放旺盛的寫作意欲，年紀尚輕便已著作等身。 2014年推出「忘卻偵探」系列，集過往創作之大成，《掟上今日子的備忘錄》甫一上市便深獲好評，並於2015年十月影視、漫畫化。