Digimon Battle Server (デジモンバトルサーバー, Dejimon Batoru Sābā) is a video game.

Digimon Battle Server was originally called Digimon Online in Korea (디지몬 온라인) and run by X2Online.

The game had a free open beta starting from Juli 25, 2002. In January 10th 2003 version 1.5 of the beta was released. Japanese website for the game was opened on February 6th 2003 renaming the Japanese release as "Digimon Battle Server" and referred to the Korean beta version as "undergoing favorable evaluation!". In May 19th 2004 beta version 2.0 was announced. However the game was shutdown few months after due to copyright infringement, terminating the Japanese version of the game before it even had a beta-version of itself.