Kengan Ashura (ケンガンアシュラ) is a Japanese manga series written by Yabako Sandrovich and illustrated by Daromeon. It was serialized on Shogakukan's Ura Sunday website from April 2012 to August 2018, with its chapters compiled into twenty-seven tankōbon volumes. A sequel, titled Kengan Omega, began in January 2019.

It was adapted into an original net animation (ONA) series. The first 12-episode part premiered in July 2019 on Netflix; the second 12-episode part premiered in October of that same year. A second season premiered in September 2023 with a 12-episode first part; the second 16-episode part premiered in August 2024.