Nisio Isin (西尾維新, Nishio Ishin), commonly stylized NisiOisiN to emphasize the palindrome, is the pen name of a Japanese novelist and manga writer. He is notably the author of Death Note Another Note: The Los Angeles BB Murder Cases, which was released in 2006 in Japanese and in 2008 in English.
Isin made his writing debut in 2002, winning the 23rd Mephisto Prize in 2002 for Kubikiri Cycle (The Beheading Cycle). This eventually became the first book in his best-selling Zaregoto series. His subsequent novels have earned him a passionate following throughout Japan.