Demon Lord 2099 (Japanese: 魔王2099, Hepburn: Maō 2099) is a Japanese light novel series written by Daigo Murasaki and illustrated by Kureta. The series began publication by Fujimi Shobo under their Fujimi Fantasia Bunko imprint in January 2021. The light novel series has been licensed in English by Yen Press. A manga adaptation by Kiiro Akashiro began serialization online in Kadokawa Shoten's Shōnen Ace Plus in November 2021.