Overlord (オーバーロード, Ōbārōdo) is a Japanese light novel series. It was written by Kugane Maruyama and the picture in the series are drawn by so-bin. Sixteen volumes of this light novel have been published since July 30, 2012. The author has said that he has planned for 18 novels. There is a manga based on this light novel by Satoshi Ōshio. The art in the manga is by Hugin Miyama. It started from November 26, 2014 in Kadokawa Shoten's manga magazine Comp Ace.
There is an anime television series based on this light novel by Madhouse. It has 3 seasons with 13 episodes each. The first season aired from July 7 to September 29, 2015. The second season ran from January 9 to April 3, 2018 and the third season from July 10, 2018 to October 2, 2018. The scriptwriter for the anime series said that the fourth season of the series was "extremely likely" to be produced.