Lineage II is a massive multiplayer online role-playing game (MMORPG) for Microsoft Windows, the second game in the Lineage series. It is a prequel to Lineage, and is set 150 years before the earlier game. It has become very popular since its October 1, 2003 launch in South Korea, reporting 1,000,918 unique users during the month of March 2007. To date, the game has been played by more than 14 million users, mostly based in Asia.

On November 30, 2011 Lineage II adopted a free-to-play model in Lineage II: Goddess of Destruction, with all game content being free save for “purchasable in-game store items and packs”.