Romelia Senki: Maō o Taoshita Ato mo Jinrui Yabasō Dakara Guntai Soshiki Shita (ロメリア戦記 ～魔王を倒した後も人類やばそうだから軍隊組織した～, Romeria Senki: Maō o Taoshita Ato mo Jinrui Yabasō Dakara Guntai Soshiki Shita, "A History of the Romelia: Even After Defeating the Demon King, Humanity Seemed to Be in Trouble so We Organized an Army") is a Japanese light novel series written by Ryō Ariyama and illustrated by Kodama (first volume) and Ryō Kamito (from second volume).

It began serialization online in August 2019 on the user-generated novel publishing website Shōsetsuka ni Narō.

Written by Ryō Ariyama, Romelia Senki: Maō o Taoshita Ato mo Jinrui Yabasō Dakara Guntai Soshiki Shita began serialization on the user-generated web novel publishing site Shōsetsuka ni Narō on August 26, 2019.

[2] It was later acquired by Shogakukan who began publishing it as a light novel with illustrations by Kodama and Ryō Kamito under their Gagaga Books light novel imprint on June 19, 2020.

[1] The manga's chapters have been collected by Mag Garden into four tankōbon volumes as of September 2024.