Blade & Soul (Korean: 블레이드 앤 소울; RR: Beulleideu aen soul) is a Wuxia-themed massively multiplayer online role-playing game developed by Korean NCSoft (Team Bloodlust). Blade & Soul was released in Western territories on January 19, 2016. A Japanese animated television adaptation aired in 2014 from April 3 to June 26 on TBS and other stations.

The mobile game adaptation Blade & Soul Revolution was released on December 6, 2018.

Blade & Soul features Wuxia-style kung fu in an open-world environment. Players create playable characters that explore the world by completing quests assigned by various NPCs. The game uses a real-time battle system in the third-person camera view and requires players to "combo" a series of attacks, much like that of fighting games. The game also features an innovative "Downed" mechanic, allowing players to recover from the brink of death. Players begin with "player-versus environment" combat (PvE) but may participate in "player-versus-player" (PvP) combat later in the game.

Blade & Soul features character customization system considered by the developers to be especially extensive at the time, including body sliders for areas as specific as the pelvis and calves, as well as options for height, hairstyle, facial structure, facial markings, makeup, and eye color.

Characters may be one of four playable races based on the Four Symbols of Chinese folklore: The Gon (based on the Azure Dragon), the Jin (based on the Black Tortoise), the Yun (based on the Vermillion Bird, also known as the Fenghuang), or the Lyn (based on the White Tiger).

Weeks before NCmedia day, NCSoft announced a new Unreal Engine 3-based MMORPG only known by its codename 'Project M. For the next two weeks, a teaser website was updated revealing more information about the project.^{[citation needed]}

During E3 2007, Sony entered into an exclusive deal with NCSoft to produce new titles exclusively for the PlayStation 3. This contract included titles from both existing intellectual properties owned by NCSoft. Blade & Soul, alongside Guild Wars 2, was initially developed for release on the PlayStation 3 and Xbox 360. There were no updates on the development of the titles for the consoles and the console versions were cancelled.

The first closed beta test was scheduled for April 27, 2011, while the open beta test and commercial release were to be determined within the year.